Document:

<PAGE>

                                                                     EXHIBIT 4.8

                      SIXTH AMENDMENT TO CREDIT AGREEMENT,
                THIRD AMENDMENT TO PLEDGE AND SECURITY AGREEMENT,
                         LENDER'S CONSENT AND AGREEMENT

         THIS SIXTH AMENDMENT TO CREDIT AGREEMENT, THIRD AMENDMENT TO PLEDGE AND
SECURITY AGREEMENT, LENDER'S CONSENT AND AGREEMENT (this "Amendment") is dated
effective December 2, 2003, by and between TYLER TECHNOLOGIES, INC., a Delaware
corporation ("Borrower") and BANK OF TEXAS, N.A., a national banking association
("Lender").

                                   WITNESSETH:

         WHEREAS, Borrower and Lender entered into that certain Credit
Agreement, dated February 27, 2002, pursuant to which Lender made the Loan (as
therein defined) available to Borrower (as heretofore or hereafter amended, the
"Credit Agreement")(each capitalized term used herein, but not otherwise defined
shall have the same meaning given to it in the Credit Agreement); and

         WHEREAS, to secure the Loan, Borrower and Lender entered into that
certain Pledge and Security Agreement dated February 27, 2002 (as heretofore or
hereafter amended, the "Tyler Pledge Agreement") whereby Borrower pledged as
security, among other things, all of its shares of stock in its Subsidiaries;
and

         WHEREAS, the Credit Agreement currently prohibits Borrower from making
any Acquisition, other than a Permitted Acquisition, without the express written
consent of Lender; and

         WHEREAS, Borrower desires to enter into that certain Stock Purchase
Agreement dated as of December 2, 2003, whereby Borrower agrees to acquire (a)
ninety five percent (95%) of the stock of Eden Systems, Inc., a Washington
corporation ("Eden Systems"), and (b) an option to acquire the remaining five
percent (5%) of the stock of Eden Systems (collectively, the "Proposed
Acquisition"); and

         WHEREAS, pursuant to the terms of the Credit Agreement, the Proposed
Acquisition does not qualify as a Permitted Acquisition;

         WHEREAS, Borrower has requested that Lender consent to the Proposed
Acquisition; and

         WHEREAS, subject to the terms and conditions herein contained, Lender
is willing to agree to such requests.

         NOW, THEREFORE, in consideration of the covenants, conditions and
agreements hereinafter set forth, and for other good and valuable consideration,
the receipt and adequacy of which are all hereby acknowledged, Borrower and
Lender hereby covenant and agree as follows:

                               ARTICLE I - CONSENT

SECTION 1.1 CONSENT TO PURCHASE OF EDEN SYSTEMS. The Credit Agreement provides,
among other things, that, without the prior written consent of Lender, Borrower
shall make no Acquisition, other than a Permitted Acquisition. Lender hereby
consents to the Proposed Acquisition. Lender further agrees that, for all
purposes of the Loan Documents, Eden Systems shall be deemed a wholly-owned
Subsidiary of Borrower so long as 95% or more of the total voting power of the
shares of capital stock entitled to vote in the election of directors of Eden
Systems is directly or indirectly owned by Borrower or any Subsidiary

SIXTH AMENDMENT(TYLER)                                                    PAGE 1

<PAGE>

(other than the Excluded Subsidiaries). Notwithstanding anything contained
herein to the contrary, Lender's consent to the Permitted Acquisition shall be
effective as of December 1, 2003, and shall not be conditioned on any of the
conditions set forth in Section 4.1 below.

SECTION 1.2 LIMITATION ON CONSENT. The consent granted in this Amendment is
limited to the foregoing action and does not constitute a waiver of any required
consent with respect to any other action.

                             ARTICLE II - AGREEMENT

SECTION 2.1 EFFECT OF ACQUISITION ON FUTURE PERMITTED ACQUISITIONS. Lender and
Borrower hereby agree that the Acquisition consented to in this Amendment shall
not reduce the $3,000,000 limit, as set forth in subsection (a) of the
definition of "Permitted Acquisition" in the Credit Agreement, within which
Borrower can make Permitted Acquisitions.

                            ARTICLE III - AMENDMENTS

SECTION 3.1 MODIFICATION TO CREDIT AGREEMENT. As of the date of this Amendment,
the following definitions shall be amended and restated, each in its entirety,
to read as follows:

         "Existing Subsidiaries" means Cole Layer Trumble Company, a Delaware
         corporation; Eagle Computer Systems, Inc., a Delaware corporation; Eden
         Systems, Inc., a Washington corporation; FundBalance, Inc., a Delaware
         corporation; Interactive Computer Designs, Inc., a Texas corporation;
         MUNIS, Inc., a Maine corporation; and The Software Group, Inc., a Texas
         corporation, but does not include the Excluded Subsidiaries.

         "Permitted Investments" shall mean (a) obligations, with a maturity of
         less than two years, with the full faith and credit of the United
         States of America, (b) direct obligations of any state of the United
         States, or municipality therein, rated in one of the two top
         classifications by S&P or Moody's and maturing within one year from
         date of acquisition, (c) certificates of deposit, eurodollar time
         deposits or banker's acceptances, maturing within two years from date
         of acquisition, issued by (1) Lender, (2) Texas Capital Bank (Dallas,
         Texas) or (3) any United States commercial bank having capital, surplus
         and undivided profits aggregating not less than $100 million and whose
         (or whose parent corporation's) unsecured long-term debt is rated in
         one of the two top classifications by S&P or Moody's, (d) repurchase
         obligations with a term of not more than seven days for underlying
         securities of the types described in clauses (b) and (c) above entered
         into with any financial institution meeting the qualifications
         specified in clause (c) above, (e) commercial paper of any United
         States corporation with a maturity of less than 270 days from date of
         acquisition and which is rated in one of the two top classifications by
         S&P or Moody's, (f) indebtedness of any United States corporation with
         a maturity of less than 270 days from date of acquisition and which is
         (1) evidenced by bonds, notes, debentures or other instruments issued
         and authenticated under an indenture qualified under the Trust
         Indenture Act of 1939, as amended, and (2) rated in one of the two top
         classifications by S&P or Moody's, (g) investments in money market or
         mutual funds at least ninety percent (90%) of the assets

SIXTH AMENDMENT(TYLER)                                                    PAGE 2

<PAGE>

         of which constitute Dollars or investments in securities of the type
         described in clauses (a) through (f) above (without regard to
         maturities), (h) investments in money market or mutual funds (other
         than those described in clause (g) above) acquired through and
         maintained in an account with Lender or any Person controlled by,
         controlling or under common control with Lender, (i) Investments in
         wholly-owned Subsidiaries of Borrower, so long as Borrower has complied
         with the requirements of Section 9.4 with respect thereto, (j) expense
         advances to employees in the ordinary course of business for travel and
         lodging not to exceed $100,000 in the aggregate at any time
         outstanding, (k) Investments in demand deposit accounts maintained with
         FDIC member banks, (l) Investments outstanding on the date of this
         Agreement that are disclosed in Schedule 9.10, and (m) Investments in
         or for the benefit of Swan pursuant to the plan of reorganization to
         which reference is made in clause (a)(iv) of Section 6.7.

SECTION 3.2 MODIFICATION TO TYLER PLEDGE AGREEMENT. As of the date of this
Amendment, Exhibit "E" to the Tyler Pledge Agreement shall be deleted and
replaced with the Exhibit "E" attached hereto as Exhibit A.

                              ARTICLE IV - WAIVER

SECTION 4.1 WAIVER OF CONTROL AGREEMENT REQUIREMENT FOR CERTAIN PERMITTED
INVESTMENT ACCOUNTS. Lender hereby (a) waives any Default or Event of Default
that may have occurred as a result of Borrower's failure to deliver a control
agreement regarding its Permitted Investments account with Texas Capital Bank in
Dallas, Texas and its Permitted Investments accounts with affiliates of Bank of
Oklahoma, N.A., and (b) agrees that Borrower shall not be obligated to deliver
control agreements regarding its Permitted Investments account with Texas
Capital Bank in Dallas, Texas or its Permitted Investments accounts with
affiliates of Bank of Oklahoma, N.A. until such time as Borrower is directed to
do so in a written notice given to Borrower by Lender.

SECTION 4.2 LIMITATION ON WAIVER. The waiver and agreement granted in Section
4.1 of this Amendment is limited to (a) Borrower's Permitted Investments account
with Texas Capital Bank in Dallas, Texas in effect on the date of this Amendment
and (b) Borrower's Permitted Investments accounts with affiliates of Bank of
Oklahoma, N.A. in effect on the date of this Amendment, and does not constitute
a waiver of any required account control agreement with respect to any account
established by Borrower after the date of this Amendment with any financial
intermediary for the purpose of holding Collateral.

                           ARTICLE V - MISCELLANEOUS

SECTION 5.1 CONDITION TO CLOSING. As a condition to the closing of this
Amendment, Borrower shall satisfied the following conditions:

         5.1.1 Borrower shall have executed and delivered this Amendment;

         5.1.2 Borrower shall have delivered that certain Amended and Restated
Subsidiary Guaranty dated effective of even date herewith executed by the
Subsidiary Guarantors (as defined therein) to and for the benefit of Lender;

SIXTH AMENDMENT(TYLER)                                                    PAGE 3

<PAGE>

         5.1.3 Borrower shall have delivered that certain Pledge and Security
Agreement dated effective of even date herewith executed by Eden Systems to and
for the benefit of Lender;

         5.1.4 Borrower shall have delivered to Lender that certain Amended and
Restated Contribution and Indemnification Agreement executed by and between
Borrower, each Guarantor (as defined therein) and Lender;

         5.1.5 Borrower shall have delivered to Lender the original stock
certificates evidencing all of the shares of stock of Eden System purchased in
the Proposed Acquisition, together with related stock powers executed in blank
by the appropriate Person;

         5.1.6 Borrower shall have delivered to Lender an Officer's Certificate
from Eden Systems dated as of the date hereof certifying, inter alia, (A) the
Articles of Incorporation or Bylaws (or equivalent corporate documents), as
amended and in effect, of Eden Systems; (B) resolutions duly adopted by the
Board of Directors of Eden Systems authorizing the transactions contemplated
hereby; and (C) the incumbency and specimen signatures of the officers of Eden
Systems authorized to execute documents on its behalf; and

         5.1.7 Borrower shall have delivered to Lender a certificate from the
appropriate public official of the jurisdiction in which Eden Systems is
organized as to the continued existence and good standing of Eden Systems.

SECTION 5.2 FURTHER ASSURANCES. In addition to the documents identified above in
Section 4.1, Borrower also agrees to provide to Lender such other documents as
may be necessary or as may be required, in the opinion of counsel to Lender, to
effect the transactions contemplated hereby and continue the liens and/or
security interests of all other collateral instruments, as modified by this
Amendment, and such other documents and instruments as Lender reasonably may
request in connection with the modification of the Loans effected hereby.

SECTION 5.3 AUTHORIZATION TO FILE. Borrower authorizes Lender to file financing
statements without notice to Borrower, with all appropriate jurisdictions, as
Lender deems appropriate, in order to perfect or protect Lender's interest in
the Collateral.

SECTION 5.4 CONTINUING EFFECT. Except as modified and amended hereby, the Credit
Agreement and other Loan Documents are and shall remain in full force and effect
in accordance with their terms.

SECTION 5.5 PAYMENT OF EXPENSES. Borrower agrees to pay to Lender the reasonable
attorneys' fees and expenses of Lender's counsel and other expenses incurred by
Lender in connection with this Amendment.

SECTION 5.6 BINDING AGREEMENT. This Amendment shall be binding upon, and shall
inure to the benefit of, the parties' respective representatives, successors and
assigns.

SECTION 5.7 NO DEFENSES. Borrower by its execution of this Amendment, hereby
declares that it has no set-offs, counterclaims, defenses or other causes of
action against Lender arising out of the Loan, this Amendment or otherwise; and,
to the extent any such setoffs, counterclaims, defenses or other causes of
action may exist, whether known or unknown, such items are hereby waived by
Borrower.

SECTION 5.8 USURY SAVINGS CLAUSE. Notwithstanding anything to the contrary in
this Amendment, the Note or any other Loan Document, or in any other agreement
entered into in connection with the Note or securing the indebtedness evidenced
by the Note, whether now existing or hereafter arising and

SIXTH AMENDMENT(TYLER)                                                    PAGE 4

<PAGE>

whether written or oral, it is agreed that the aggregate of all interest and
other charges constituting interest, or adjudicated as constituting interest,
and contracted for, chargeable or receivable under the Note or otherwise in
connection with the Note shall under no circumstances exceed the maximum rate of
interest permitted by applicable law. In the event the maturity of the Note is
accelerated by reason of an election by the holder thereof resulting from a
default thereunder or under any other document executed as security therefor or
in connection therewith, or by voluntary prepayment by the maker, or otherwise,
then earned interest may never include more than the maximum rate of interest
permitted by applicable law. If from any circumstance any holder of any of the
Note shall ever receive interest or any other charges constituting interest, or
adjudicated as constituting interest, the amount, if any, which would exceed the
maximum rate of interest permitted by applicable law shall be applied to the
reduction of the principal amount owing on such Note or on account of any other
principal indebtedness of the maker to the holders of such Note, and not to the
payment of interest, or if such excessive interest exceeds the unpaid balance of
principal thereof and such other indebtedness, the amount of such excessive
interest that exceeds the unpaid balance of principal thereof and such other
indebtedness shall be refunded to the maker. All sums paid or agreed to be paid
to the holder of the Note for the use, forbearance or detention of the
indebtedness of the maker to the holder of such Note shall be amortized,
prorated, allocated and spread throughout the full term of such indebtedness
until payment in full for the purpose of determining the actual rate on such
indebtedness is uniform throughout the term thereof.

         The terms "maximum amount" or "maximum rate" as used in this Amendment
or the Note, or in any other agreement entered into in connection with the Note
or securing the indebtedness evidenced by the Note, whether now existing or
hereafter arising and whether written or oral, include, as to Chapter 303 of the
Texas Finance Code (and as same may be incorporated by reference in other
statutes of the State of Texas), but otherwise without limitation, that rate
based upon the "weekly ceiling"; provided, however, that this designation shall
not preclude the rate of interest contracted for, charged or received in
connection with the Loan from being governed by, or construed in accordance
with, any other state or federal law.

SECTION 5.9 COUNTERPARTS. This Amendment may be executed in several
counterparts, all of which are identical, each of which shall be deemed an
original, and all of which counterparts together shall constitute one and the
same instrument, it being understood and agreed that the signature pages may be
detached from one or more of such counterparts and combined with the signature
pages from any other counterpart in order that one or more fully executed
originals may be assembled.

SECTION 5.10 CHOICE OF LAW. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED
IN ACCORDANCE WITH, THE LAWS OF THE STATE OF TEXAS, EXCEPT TO THE EXTENT FEDERAL
LAWS PREEMPT THE LAWS OF THE STATE OF TEXAS.

SECTION 5.11 ENTIRE AGREEMENT. This Amendment, together with the other Loan
Documents, contain the entire agreements between the parties relating to the
subject matter hereof and thereof. This Amendment and the other Loan Documents
may be amended, revised, waived, discharged, released or terminated only by a
written instrument or instruments, executed by the party against which
enforcement of the amendment, revision, waiver, discharge, release or
termination is asserted. Any alleged amendment, revision, waiver, discharge,
release or termination which is not so documented shall not be effective as to
any party.

         THIS AMENDMENT AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL
AGREEMENT BETWEEN THE PARTIES RELATED TO THE SUBJECT MATTER HEREIN CONTAINED AND
MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE
PARTIES.

SIXTH AMENDMENT(TYLER)                                                    PAGE 5

<PAGE>

         IN WITNESS WHEREOF, this Amendment is executed effective as of the date
first written above.

                                     LENDER:

                                     BANK OF TEXAS, N.A., a national banking
                                     association

                                     By:
                                        ---------------------------------------
                                           Mark Wade
                                           Senior Vice President

                                     BORROWER:

                                     TYLER TECHNOLOGIES, INC. a Delaware
                                     corporation

                                     By:
                                        ---------------------------------------
                                           Brian K. Miller,
                                           Vice President-Finance

SIXTH AMENDMENT(TYLER)                                            SIGNATURE PAGE

<PAGE>

                                    EXHIBIT A

                           List of Pledged Securities

                    (See Section 3.11 of Security Agreement)

A. STOCKS:

<Table>
<Caption>

                                                                        CERTIFICATE   NUMBER OF
ISSUER                                 SHAREHOLDER                        NUMBER       SHARES
------                                 -----------                      -----------   ---------
<S>                                    <C>                              <C>           <C>
Cole Layer Trumble Company             Tyler Technologies, Inc.              2          1,000
Eagle Computer Systems, Inc.           Tyler Technologies, Inc.              2          1,000
FundBalance, Inc.                      Tyler Technologies, Inc.              2          1,000
Interactive Computer Designs, Inc.     Tyler Technologies, Inc.              2          1,000
MUNIS, Inc.                            Tyler Technologies, Inc.             13           5000
The Software Group, Inc.               Tyler Technologies, Inc.              2          1,000
Eden Systems, Inc.                     Tyler Technologies, Inc.                        47,500
</Table>

B. BONDS:

<Table>
<Caption>

Issuer            Number            Face Amount          Coupon Rate         Maturity
------            ------            -----------          -----------         --------
<S>               <C>               <C>                  <C>                 <C>
None
</Table>

C. GOVERNMENT SECURITIES:

<Table>
<Caption>

Issuer            Number   Type     Face Amount       Coupon Rate       Maturity
------            ------   ----     -----------       -----------       --------
<S>               <C>      <C>      <C>               <C>               <C>
None
</Table>

D. OTHER SECURITIES OR OTHER INVESTMENT PROPERTY
   (CERTIFICATED AND UNCERTIFICATED):

<Table>
<Caption>

Issuer            Description of Collateral        Percentage Ownership        Interest
------            -------------------------        --------------------        --------
<S>               <C>                              <C>                         <C>
None
</Table>

EXHIBIT A - SIXTH AMENDMENT(Tyler)                                       PAGE 1<PAGE>
                                                                    EXHIBIT 10.8

                    EMPLOYMENT AND NON-COMPETITION AGREEMENT

         This Employment and Non-Competition Agreement (this "Agreement") is
between Tyler Technologies, Inc., a Delaware corporation (the "Company"), on the
one hand, and Dustin R. Womble ("Executive"), on the other hand. This Agreement
is dated to be effective as of July 1, 2003 (the "Effective Date").

         The Company desires to employ Executive under the terms and conditions
set forth in this Agreement, Executive hereby representing that he is free from
any other obligation of continuing employment with any other employer.

         Executive desires employment as an employee of the Company under the
terms and subject to the conditions set forth in this Agreement.

         The non-competition and confidentiality obligations of Executive as set
forth in this Agreement are a material inducement for the Company to enter into
this Agreement, and the Company would not enter into this Agreement absent such
covenants by Executive.

         NOW, THEREFORE, in consideration of the mutual covenants and agreements
contained in this Agreement, and for other good and valuable consideration, the
receipt and sufficiency of which all parties mutually acknowledge, the parties
agree as follows:

         1. Employment. The Company hereby employs Executive, and Executive
hereby accepts such employment, on the terms and subject to the conditions set
forth in this Agreement.

         2. Duties of Executive.

                  (a) Executive will serve in the capacity of Executive Vice
         President of the Company or such other capacity as may be assigned to
         Executive by the Chief Executive Officer or the Board of Directors,
         which capacity will be commensurate with the education, experience, and
         skills of Executive. In such capacities, Executive shall have all
         necessary power and authority to discharge his responsibilities.
         Executive will report to the Chief Executive Officer of the Company.

                  (b) Executive will devote his full business time and effort to
         the performance of his duties and responsibilities as Executive Vice
         President of the Company, excluding vacation and reasonable absence due
         to illness.

                  (c) Executive will perform his duties in a professional manner
         and will use his best efforts, skills, and abilities to promote,
         enhance, and preserve the business of the Company and its affiliates
         and the goodwill and relationships they have with their employees,
         agents, representatives, customers, suppliers, and other persons having
         business relations with any of them.

                  (d) Executive shall observe and comply with the written rules
         and regulations of the Company with respect to its business and shall
         carry out and perform the directives and policies of the Company as the
         Board of Directors or Chief Executive Officer may from time to time
         state them to Executive in writing.

<PAGE>

         3. Employment Term. This Agreement shall commence as of the Effective
Date and continue for a period of five (5) years; provided, however, that at the
end of such initial term the term shall automatically extend for an additional
year unless the Company provides, at least six (6) months prior to the end of
such initial term or subsequent anniversary of the end of such initial term,
written notice that it does not wish to extend the term. Notwithstanding the
foregoing, this Agreement may be earlier terminated in accordance with Section 7
of this Agreement.

         4. Compensation.

                  (a) Base Salary. For services performed by Executive pursuant
         to this Agreement, the Company will pay Executive during the term of
         this Agreement a base salary at the rate of $220,000 per year (the
         "Base Salary"), which shall be payable in accordance with the Company's
         standard payroll practices but not less than monthly. The Base Salary
         shall not be subject to reduction, but may be increased at the
         discretion of the Compensation Committee of the Board of Directors or
         the Board of Directors as a whole. Any compensation that may be paid to
         Executive under any additional compensation or incentive plan or which
         may be otherwise authorized from time to time by the Board of Directors
         shall be in addition to the Base Salary to which Executive is entitled
         under this Agreement.

                  (b) Annual Bonus. For each calendar year during the term of
         this Agreement, Executive shall be eligible to receive an annual
         performance bonus (the "Bonus"), which shall be established and paid in
         accordance with the incentive compensation plan set forth as Exhibit A
         (or as otherwise established by the Executive Committee and/or
         Compensation Committee of the Tyler Board of Directors). The Bonus will
         be paid in accordance with the Company's standard bonus payment
         practices.

                  (c) Equity Grants. During the term of this Agreement,
         Executive shall be eligible and participate, in an appropriate manner
         relative to other senior executives of the Company and consistent with
         competitive pay practices generally, in any equity-based incentive
         compensation plan or program of the Company, including, without
         limitation, any plan or program providing for the grant of (i) options
         to purchase common stock of the Company, (ii) restricted stock of the
         Company, or (iii) similar equity-based units or interests. In
         consideration of the mutual promises contained herein, the Company
         shall grant Executive effective as of the Effective Date options to
         purchase 200,000 shares of Company Common Stock, $.01 par value per
         share, subject to the terms and conditions of the Company's Amended and
         Restated Stock Option Plan and the Company's standard stock option
         agreement.

         5. Executive Benefits. During the term of this Agreement, the Company
shall provide Executive with all benefits made available from time to time by
the Company to its senior executives and to its employees generally, including,
without limitation, participation in medical and dental benefit plans and
programs, disability and death insurance, 401-K plans, paid vacation, and other
fringe benefits.

         6. Reimbursement of Expenses. The Company shall reimburse Executive for
all expenses actually and reasonably incurred by Executive in the business
interests of the Company. Such reimbursement shall be made to Executive upon
appropriate documentation of such expenditures in accordance with the Company's
policies.

                                       2
<PAGE>

         7. Early Termination.

                  (a) It is the desire and expectation of each party that the
         employer-employee relationship will continue for the full term as set
         forth in Section 3 of this Agreement. The Company shall, however, be
         entitled to terminate Executive's employment at any time with or
         without Cause (as defined below), subject to the restrictions contained
         in this Section 7.

                  (b) If Executive's employment is terminated by the Company
         without Cause prior to the expiration of this Agreement, the Company
         shall pay Executive a lump sum amount equal to Executive's Base Salary
         (i) still due for the remainder of the term of this Agreement or (ii)
         for a period of twelve (12) months, whichever is greater. Executive
         shall also be entitled to receive the benefits set forth in Section 5
         for a period equal to the greater of twelve (12) months or the number
         of months then remaining on the term of this Agreement. A Change of
         Control (as defined below) shall be deemed to be a termination without
         Cause, unless otherwise agreed in writing by Executive.

                  (c) If Executive dies, is unable to perform his duties and
         responsibilities as a result of a disability that continues for one
         hundred and eighty (180) consecutive days or more, voluntarily resigns
         from the Company, or is terminated by the Company for Cause (as defined
         below), the Company shall pay Executive (or his estate, executor, or
         legal representative, as the case may be) any accrued and unpaid Base
         Salary and finally determined and unpaid Bonus to the date employment
         ceases, and the Company's obligations to pay additional salary, cash
         compensation, or benefits shall terminate as of such date. In addition,
         if the Company terminates Executive due to disability, the Company will
         continue to pay the benefits outlined in Section 5 to Executive and
         Executive's dependents for a period equal to the greater of twelve (12)
         months or the number of months then remaining on the term of this
         Agreement.

                  (d) For purposes of this Agreement, "Cause" means a
         determination by the Board of Directors of the Company or Tyler that
         Executive has: (i) failed or been unable for any reason to devote
         substantially all of his time during normal business hours to the
         business of the Company and its affiliates (except for vacations and
         absence due to illness); (ii) been convicted of any felony; (iii)
         committed any act or engaged in any conduct that is fraudulent or
         constitutes malfeasance or a breach of fiduciary duties of Executive;
         (iv) persistently failed to abide by the corporate policies and
         procedures as set forth in the Company's or Tyler's employee handbook;
         (v) persistently failed to execute the reasonable and lawful
         instructions of the Company's or Tyler's Board of Directors relating to
         the operation of the Company's business; or (vi) committed any material
         or continuing breach of any of the terms of, or has materially or
         continually failed to perform any covenant contained in, this Agreement
         to be performed by Executive. With respect to (i), (iv), (v), and (vi)
         above, Executive may not be terminated for Cause unless Executive fails
         to cure such breach or failure of performance within thirty (30) days
         after written notice of such breach or failure.

                  (e) For purposes of this Agreement, "Change of Control" means
         approval by the shareholders of the Company of a merger or
         consolidation of the Company into an unaffiliated entity, the
         dissolution or liquidation of the Company, the sale of all or
         substantially all of the assets of the Company, the acquisition by any
         person, entity, or group of more than 50% of the voting stock of the
         Company, or a change in

                                       3
<PAGE>

         a majority of the Company's Board of Directors that was not approved by
         the then existing Board of Directors.

         8. Confidential Information.

                  (a) Executive acknowledges that the Company and its affiliates
         are continuously developing or receiving Confidential Information (as
         defined below), and that during Executive's employment, Executive will
         receive Confidential Information from the Company and its affiliates
         and will receive special training relating to the Company's and its
         affiliates' business methodologies. Executive further acknowledges and
         agrees that Executive's employment by the Company creates a
         relationship of confidence and trust between Executive and the Company
         and its affiliates that extends to all Confidential Information that
         becomes known to Executive. Accordingly, Executive will not disclose or
         use any Confidential Information, except in connection with the good
         faith performance of his duties as an officer and employee, and will
         take reasonable precautions against the unauthorized disclosure or use
         of Confidential Information. Upon the Company's request, Executive will
         execute and comply with a third party's agreement to protect its
         confidential and proprietary information. In addition, Executive will
         not solicit or induce the unauthorized disclosure or use of a third
         party's confidential or proprietary information for the benefit of the
         Company or its affiliates.

                  (b) For purposes of this Agreement, "Confidential Information"
         means all written, machine-reproducible, oral and visual data,
         information, and material, including, without limitation, business,
         financial, and technical information, computer programs, documents, and
         records (including those that Executive develops in the scope of his
         employment) that (i) the Company and its affiliates, or any of their
         respective customers or suppliers treats as confidential or proprietary
         through markings or otherwise, (ii) relates to the Company and its
         affiliates, or any of their respective customers or suppliers or any of
         their respective business activities, products, or services (including
         software programs and techniques) and is competitively sensitive or not
         generally known in the relevant trade or industry, or (iii) derives
         independent economic value from not being known to, and is not
         generally ascertainable by proper means by, other persons who can
         obtain economic value from its disclosure or use. Confidential
         Information shall not include information or material that: (A) was in
         the public domain prior to the date of this Agreement or subsequently
         came into the public domain through no fault of Executive; (B) was
         lawfully received by Executive from a third party free of any
         obligation of confidentiality; (C) is approved by the Company for
         unrestricted public disclosure; or (D) is required to be disclosed in a
         judicial or administrative proceeding or by a governmental or
         regulatory authority, domestic or foreign.

         9. Non Compete; No Solicitation.

                  (a) Executive understands that, during the course of his
         employment by the Company, Executive will have access to and receive
         the benefit of Confidential Information (as defined in Section 8) and
         special training, as well as come into contact with customers and
         potential customers of the Company and its affiliates, which
         Confidential Information, training, knowledge, and contacts would
         provide invaluable benefits to competitors and potential competitors of
         the Company and its affiliates. To protect such entities' interest in
         this information and in these contacts and relationships, and in
         consideration for the Company entering into this Agreement, Executive
         agrees and covenants that for a period beginning on the

                                       4
<PAGE>

         Effective Date of this Agreement and continuing until (i) if Executive
         voluntarily resigns or is terminated for Cause, the then remaining term
         of this Agreement, or (ii) if Executive is terminated without Cause
         pursuant to Section 7(b), the greater of one year or the then remaining
         term of this Agreement, Executive will not (without the prior written
         consent of the Company), directly or indirectly, (A) engage in any
         business that provides the same or competitive products or services as
         those provided by the Company and its affiliates (including Incode,
         Inc.) in the State of Texas or in any other state in which the Company
         or its affiliates (including Incode, Inc.) is conducting or conducts
         such business during the term of this Agreement or at the time of
         termination of Executive's employment hereunder, or (B) solicit or
         encourage or assist other persons or entities to solicit or encourage
         any customers of the Company or its affiliates (including Incode, Inc.)
         to terminate or materially alter their relationship with the Company or
         its affiliates or to become a customer of any other person or entity
         competing with the Company or its affiliates, or (C) recruit, solicit
         or hire, or encourage or assist other persons or entities to recruit,
         solicit or hire, any employees of the Company or its affiliates.

                  (b) Executive understands and agrees that the foregoing
         covenant is reasonable as to time, area, and scope and is necessary to
         protect the legitimate business interests of the Company and its
         affiliates. It is further agreed that such covenant will be regarded as
         divisible and will be operative as to time, area, and scope to the
         extent it may be so operative, and if any part of such covenant is
         declared invalid, unenforceable, or void as to time, area, or scope,
         the validity and enforceability of the remainder will not be affected.

                  (c) Executive understands and acknowledges that the
         determination of damages in the event of a breach of any provision of
         this Section 9 would be difficult. Executive agrees that the Company or
         its affiliates, in addition to all other remedies it or any of them may
         have at law or in equity (and notwithstanding Section 19), will have
         the right to injunctive relief if there is a breach without the
         necessity of proving the inadequacy or unavailability of damages as an
         effective remedy.

         10. Proprietary Rights.

                  (a) Executive will disclose to the Company all works of
         authorship and inventions that Executive produces while employed by the
         Company, working alone or jointly with others, including all computer
         programs, documents, and records, together with all related ideas,
         know-how, and techniques. These disclosures will be considered
         Confidential Information. All copyrights, patent rights, and other
         intellectual property rights in and to works of authorship and
         inventions that Executive produces while employed by the Company,
         working alone or jointly with others, are intended to be and will be
         owned exclusively by the Company, except for such rights, interests,
         and works that are not assigned to the Company pursuant to Section
         10(b).

                  (b) Executive assigns to the Company all of his rights in and
         to all works of authorship and inventions that Executive produces while
         employed by the Company, working alone or jointly with others, and
         waives all rights therein. Executive agrees to sign, without additional
         compensation, all necessary documents and otherwise assist the Company,
         at its expense, to register and enforce all copyrights, patents, and
         other intellectual property rights. Executive appoints the Company as
         his attorney-in-fact for the sole purpose of executing all necessary
         documents relating to the registration or enforcement of any
         copyrights, patents, and

                                       5
<PAGE>

         other intellectual property rights produced while employed by the
         Company and assigned to the Company in accordance with, and subject to
         the restrictions contained in, this Section 10. Notwithstanding the
         foregoing, Executive does not assign works of authorship or inventions
         which (i) Executive developed on his own time without using the
         Company's equipment, facilities, supplies, or Confidential Information,
         or (ii) do not relate to either (A) the Company's or its affiliates'
         business, (B) the Company's or its affiliates' actual or demonstrably
         anticipated research or development, or (C) work done by Executive for
         the Company or its affiliates.

                  (c) The Company can waive the rights in any work of authorship
         or invention only through a written instrument signed by an officer of
         the Company after Executive has fully and completely disclosed in
         writing the existence and nature of that work or authorship or
         invention.

         11. End of Employment

                  (a) Executive agrees that all documents of any nature
         pertaining to the activities of the Company or its affiliates, or that
         include Confidential Information, in his possession now or at any time
         during the term of his employment, including, without limitation,
         memoranda, notebooks, notes, data sheets, records, and computer
         programs, are and shall be the property of the Company and that all
         copies thereof shall be surrendered to the appropriate entity upon end
         of employment.

                  (b) Executive authorizes the Company to offset any liquidated
         amounts payable or reimbursable to the Company by Executive against,
         and to withhold such amounts from, any amounts payable or reimbursable
         to Executive by the Company, including, without limitation, any base
         salary, bonus, other incentive compensation, and expense reimbursements
         to the maximum extent permitted by law.

         12. Specific Performance. The parties hereby acknowledge and agree that
the failure of either party to perform the agreements and covenants set forth in
Section 8, Section 9, Section 10, and Section 11 of this Agreement will cause
irreparable injury to the other party for which damages, even if available, may
not be an adequate remedy. Accordingly, each party hereby consents,
notwithstanding Section 19, to the issuance of injunctive relief by any court of
competent jurisdiction to compel performance of such party's obligations and to
the granting by any court of the remedy of specific performance of such
obligations.

         13. Continuing Obligations. Executive acknowledges and agrees that the
provisions of Section 8, Section 9, Section 10, and Section 11 will survive the
termination or expiration of this Agreement.

         14. Notices. Any notice, consent, demand, or request, or other
communication to be given under this Agreement must be in writing and shall be
deemed given or made when delivered in person or within three (3) days upon
being sent certified mail, postage prepaid with return receipt requested, to the
following addresses:

         If to the Company:    Tyler Technologies, Inc.
                               5949 Sherry Lane, Suite 1400
                               Dallas, Texas 75225

         If to Executive:      Home address of Executive,
                               as shown on current records of the Company

                                       6
<PAGE>

         15. Entire Agreement. This Agreement constitutes the entire agreement
among the parties hereto pertaining to the specific subject matter hereof and
supersedes all prior agreements, whether written or oral, between the parties
with respect to the terms and conditions of employment of Executive by the
Company.

         16. Modification. Any change or modification of this Agreement shall
not be valid or binding upon the parties, nor will any waiver of any term or
condition in the future be binding, unless the change or modification or waiver
is in writing and signed by all parties hereto.

         17. Waiver of Breach. The waiver by the Company of a breach of any
provision of this Agreement by Executive will not operate or be construed as a
waiver of any subsequent breach by Executive.

         18. Governing Law. This Agreement is governed by, and will be construed
in accordance with, the substantive laws of the State of Texas, without giving
effect to any conflicts-of-law, rule, or principle that might require the
application of the laws of another jurisdiction.

         19. Arbitration. Any controversy, dispute, or claim arising under this
Agreement will be finally settled by arbitration conducted in accordance with
the American Arbitration Association Rules then in effect; provided, however,
that the parties will be obligated to negotiate in good faith for a period of
thirty (30) days to resolve such controversy, dispute, or claim prior to
submitting the same to arbitration. Any such arbitration proceeding will take
place in the City of Dallas, Texas, and the arbitrator will apply the laws of
the State of Texas. Any decision rendered by the arbitrator will be final and
binding and judgment thereon may be entered in any court having jurisdiction or
application thereon may be made to such court for an order of enforcement as the
case may require. The parties intend that this agreement to arbitrate be
irrevocable. If arbitration is invoked in accordance with the provisions of this
Agreement, the prevailing party will be entitled to receive from the other all
costs, fees, and expenses pertaining to or attributable to such arbitration,
including reasonable attorneys' fees.

         20. Counterparts. This Agreement may be executed in one or more
counterparts, each of which will constitute one document.

IN WITNESS WHEREOF, the parties have caused this Agreement to be executed and
effective as of the date first written above.

EXECUTIVE                                    TYLER TECHNOLOGIES, INC.,
                                             a Delaware corporation

By:    /s/ Dustin R. Womble            By:   /s/ John M. Yeaman
       --------------------                  ------------------
Name:  Dustin R. Womble                      Name: John M. Yeaman
                                             Title: President and Chief
                                                    Executive Officer

                                       7
<PAGE>

                    EMPLOYMENT AND NON-COMPETITION AGREEMENT

                                    EXHIBIT A

                           INCENTIVE COMPENSATION PLAN

Attach copy of the Tyler Technologies, Inc. Incentive Compensation Plan.

                                       8

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