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                                                                  EXHIBIT 10.13

OFFER LETTER, ERIC WILLGOHS

July 20, 1999

Eric Willgohs

Dear Eric,

I am pleased to offer you the position of General Counsel, Vice President Legal
for Broadbase Software, Inc., reporting directly to me.

This letter outlines the proposed terms of employment with Broadbase.

-       Your annual salary will be $120,000 paid semi-monthly

-       Your "at target" pay including base salary and bonus is $50,000.

-       You will start immediately.

I will recommend that you will be granted an option to purchase 60,000 shares of
stock. This grant is subject to approval by the Board of Directors at its first
meeting after your employment begins. The option would vest over four years and
would be governed by the terms set forth in the Company's standard form of stock
options agreement. The purchase price of each of the shares covered by the
option will be the closing price of the Company's common stock on the date of
the approval of the grant by the Board. In the event of a change in control of
50% or more of the stock of Broadbase coupled with the termination of your
employment as General Counsel, then 50% of your unvested shares shall
immediately vest.

The Company will provide to you the health, holiday, vacation and other benefits
available to all its employees. Enclosed, for your review, is information
related to some of the benefits.

To indicate your acceptance of this offer of employment, please sign below and
return on or before, Monday, July 26, 1999. Employment at Broadbase is subject
to your signing the attached nondisclosure and inventions agreement, as well.
Please also understand that your employment is not governed by any written or
oral contract and is considered an "at-will" agreement. This means that you are
free, as is the Company, to terminate the employment relationship at any time
for any reason, so long as there is not violation of applicable state or federal
law.

Eric, all of us welcome you in joining Broadbase and we look forward to having
you on our team. Meanwhile, if you have any questions, please do not hesitate to
call me at (650) 614-8304.

Sincerely,

Chuck Bay
Chief Financial Officer
EVP Business Development

Accepted

Signature: /s/ Eric Willgohs
           ------------------------------

Name:  Eric Willgohs

Start Date:
           ------------------------------<PAGE>   1

                                                                  EXHIBIT 10.14

                              EMPLOYMENT AGREEMENT

        THIS AGREEMENT is entered into as of September 18, 2000, by and between
MASSOOD ZARRABIAN (the "Employee") and BROADBASE SOFTWARE, INC., a Delaware
corporation (the "Company"). This Agreement shall be effective at the effective
time of the merger (the "Merger") contemplated by the Agreement and Plan of
Merger dated September 18, 2000, by and among the Company, Servicesoft, Inc., a
Delaware corporation ("FormerCo"), and Soldier Acquisition Corp., a Delaware
Corporation and a wholly owned subsidiary of the Company (the "Merger
Agreement"). This Agreement shall be null and void, and no parties shall be
deemed to have any rights hereunder, unless and until the Merger is consummated
(the time of such consummation being the "Effective Time").

        1. DUTIES AND SCOPE OF EMPLOYMENT.

           (a) POSITION. The Company agrees to employ the Employee in the
position (the "Position") of President, E-Service Division (the "Employment").
The Employee shall report to the Company's CEO.

           (b) OBLIGATIONS TO THE COMPANY. During his Employment, the Employee
shall devote his full business efforts and time to the Company. During his
Employment, without the prior written approval of the Company's Board of
Directors, the Employee shall not render services in any capacity to any other
person or entity and shall not act as a sole proprietor or partner of any other
person or entity or as a shareholder owning more than five percent of the stock
of any other corporation. The Employee shall have those responsibilities as the
Company may reasonably determine to be consistent with the Employee's position.
The Employee shall comply with the Company's policies and rules, as they may be
in effect from time to time during his Employment.

           (c) NO CONFLICTING OBLIGATIONS. The Employee represents and warrants
to the Company that he is under no obligations or commitments, whether
contractual or otherwise, that are inconsistent with his obligations under this
Agreement. The Employee represents and warrants that he will not use or
disclose, in connection with his employment by the Company, any trade secrets or
other proprietary information or intellectual property in which the Employee or
any other person has any right, title or interest and that his employment by the
Company as contemplated by this Agreement will not infringe or violate the
rights of any other person. The Employee represents and warrants to the Company
that he has returned all property and confidential information belonging to any
prior employer.

        2. SALARY. The Company shall pay the Employee as compensation for his
services a base salary at a gross annual rate of not less than $200,000.
Employee will be eligible for a target bonus of $60,000 pursuant to the
Company's bonus policy. Such salary and bonus shall be payable in accordance
with the Company's standard payroll procedures.

        3. VACATION AND EMPLOYEE BENEFITS. During his Employment, the Employee
shall be eligible for paid vacations in accordance with the Company's standard
policy for similarly-situated employees, as it may be amended from time to time.
During his Employment, the Employee shall be eligible to participate in the
employee benefit plans maintained by the Company for similarly-situated
employees, subject in each case to the generally applicable terms and conditions
of the plan in question and to the determinations of any person or committee
administering such plan.

        4. BUSINESS EXPENSES. During his Employment, the Employee shall be
authorized to incur necessary and reasonable travel, entertainment and other
business expenses in connection with his duties hereunder. The Company shall
reimburse the Employee for such expenses upon presentation of an itemized
account and appropriate supporting documentation, all in accordance with the
Company's generally applicable policies.

        5. VESTING OF EQUITY IN THE COMPANY. Notwithstanding any provision in
any plan, employment agreement, offer letter or other agreement between Employee
and FormerCo ("Prior Agreements") to the contrary, of the Employee's remaining
unvested shares of FormerCo common stock, or unvested options to

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purchase shares of FormerCo common stock, that are exchanged for shares of, or
options to purchase shares of, Common Stock of the Company on the date of the
Merger ("Restricted Shares"), fifty percent (50%) of such Restricted Shares
resulting from the option grant to the Employee dated July 10, 2000 ("Restricted
CEO Shares") shall become vested on the date of the Merger, and the remaining
Restricted Shares shall be initially unvested; thereafter, for so long as
Employee remains continuously under employment to the Company pursuant to this
Agreement, and subject to the provisions of Section 6, the remaining Restricted
CEO Shares shall vest ratably on each monthly anniversary of the Effective Time
over the period lasting two years from the Effective Time, and all additional
remaining Restricted Shares shall continue to vest in accordance with their
original vesting schedules. Notwithstanding the provisions of any Prior
Agreement, service to the Company in any fashion other than employment under
this agreement shall not serve to extend vesting of the Restricted Shares.
Employee agrees to cancel any right that Employee had to accelerated vesting or
other additional vesting of the Restricted Shares as a result of any Prior
Agreements. Any portion of the Restricted Shares that do not vest pursuant to
this Section 5 and/or Section 6 shall be forfeited.

        6. TERM OF EMPLOYMENT.

           (a) EMPLOYMENT AT WILL. Either party may terminate the Employee's
Employment at any time and for any reason (or no reason), and with or without
cause, by giving the other party notice in writing. The Employee's Employment
with the Company shall be "at will," meaning that either the Employee or the
Company shall be entitled to terminate the Employee's employment at any time and
for any reason, with or without cause. Any contrary representations that may
have been made to the Employee shall be superseded by this Agreement. This
Agreement shall constitute the full and complete agreement between the Employee
and the Company on the "at will" nature of the Employee's Employment, which may
only be changed in an express written agreement signed by the Employee and a
duly authorized officer of the Company.

           (b) RIGHTS UPON TERMINATION OF EMPLOYMENT. Immediately upon
Termination of the Employee's Employment pursuant to this Section 6, the
Employee shall tender to the Company his resignation from the Board of Directors
of the Company, and shall also resign from any other directorships or other
positions held with subsidiaries of the Company. Upon the termination of the
Employee's Employment pursuant to this Section 6, the Employee shall only be
entitled to the compensation, benefits and reimbursements described in Sections
2, 3, 4, 5 and 6 for the period preceding the effective date of the termination,
and any severance that may be provided pursuant to Section 6(d). The payments
under this Agreement shall fully discharge all responsibilities of the Company
to the Employee.

           (c) TERMINATION OF AGREEMENT. This Agreement shall terminate when all
obligations of the parties hereunder have been satisfied. Any earlier
termination of this employment hereunder shall not limit or otherwise affect any
of the Employee's obligations under Sections 7 and 8.

           (d) SEVERANCE AND ACCELERATION OF VESTING.

           (1) CASH SEVERANCE. Notwithstanding the foregoing, if Employee's
employment is terminated within the Noncompetition Term (i) by Broadbase without
"Cause", or (ii) by Employee, after "Constructive Termination" by Broadbase
without Cause, then Employee shall be entitled to one year of base salary plus
target bonus, payable in one lump sum.

           (2) ACCELERATION OF VESTING. Notwithstanding the foregoing, if
Employee's agreement is terminated within two years of the Effective Time (i) by
Broadbase without "Cause", or (ii) by Employee, after "Constructive Termination"
by Broadbase without Cause, then one hundred percent (100%) of the then
remaining unvested Restricted CEO Shares, and fifty percent (50%) of any
additional then remaining unvested Restricted Shares, shall become immediately
vested and exercisable as of the time of such termination. Any determination by
the Board of Directors of the Company, after written notice to Employee and
providing Employee an opportunity to be heard, regarding whether an event
described in this Subsection 6(d) has occurred, shall be conclusive, whether or
not there are any proceedings by public authorities with respect thereto and
without regard to the outcome thereof.

           The term "CAUSE" shall mean:

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                              (i) Any material breach by the Employee of this
               Agreement between the Employee and the Company, if either (i)
               such breach is of a nature which cannot be cured, or (ii) such
               breach is of a nature which can be cured but which remains
               uncured fifteen days after written notice of breach;

                              (ii) A determination by a majority of the Board of
               Directors of the Company that the Employee has engaged in willful
               misconduct causing significant harm to the Company or that is
               repeated or continues after written notice from the CEO or the
               Board of the Company;

                              (iii) Conviction of the Employee, or a plea of
               "guilty" or "no contest"by the Employee to, a felony under the
               laws of the United States or any state thereof;

                              (iv) Misappropriation by the Employee of the
               assets of the Company or other acts of fraud or embezzlement;

                              (v) The repeated or ongoing abuse of alcohol or
               controlled substances by the Employee that has a repeated or
               ongoing detrimental effect upon the Employee's performance of his
               duties under this Agreement and that continues or is repeated
               after 30 days written notice from the Company; or

                              (vi) A determination by a majority of the Board of
               Directors of the Company that there has occurred substantial and
               continuing neglect or inattention by the Employee of duties of
               his employment which shall continue for 30 business days
               following written notice by the Board of Directors.

                              The term "CONSTRUCTIVE TERMINATION" shall mean a
               material reduction in the Employee's base salary or total target
               compensation; any diminution or material adverse change to the
               Employee's title, reporting position and responsibilities
               constituting a de facto demotion; any material breach by the
               Company of this Agreement that is not cured within thirty (30)
               days after written notice from the Employee to the Company,
               including, without limitation, the wrongful failure of the
               Company to pay the Employee any material portion of his
               compensation; or the Company requiring the Employee to be based
               at and to work out of any office or location more than 35 miles
               from the location where the Employee is currently based at and
               working out of for FormerCo; provided, however, that in no event
               shall any of the changes contemplated by this Agreement to occur
               at the Effective time (i.e., assumption of new titles, etc.)
               constitute a Constructive Termination hereunder.

           (e) RELEASE. Subsection (d) above shall not apply unless the Employee
(i) has executed a general release (in a form prescribed by the Company) of all
known and unknown claims that he may then have against the Company or persons
affiliated with the Company and which such claims are in any way related to such
termination, Constructive Termination, or Cause for either, and (ii) has agreed
not to prosecute any legal action or other proceeding based upon any of such
claims; provided that such release shall not extend to claims for benefits under
this Agreement for accrued compensation and benefits or indemnification as an
officer or employee of FormerCo, the Company or any of their affiliates.

        7. NON-DISCLOSURE. This Agreement is contingent upon the Employee's
execution of the Company's form of Proprietary Information and Inventions
Agreement, a copy of which is attached hereto as EXHIBIT A. If any provisions of
such Proprietary Information and Inventions Agreement are in conflict with the
provisions of this Agreement, the provisions of this Agreement shall control.

        8. NON-COMPETITION, NON-SOLICITATION AND SAVINGS CLAUSE.

           (a) NONCOMPETITION TERM. For the longer of (i) a period of two years
following the Effective Time (the "NONCOMPETITION TERM"), or (ii) one year after
termination of employment hereunder, the

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Employee hereby agrees that, without the written consent of Broadbase, directly
or indirectly, individually or as an employee, partner, officer, director or
shareholder or in any other capacity whatsoever of or for any person, firm,
partnership, company or corporation other than Broadbase or its subsidiaries
(other than as a holder of less than 1% of the outstanding capital stock of a
publicly-traded company), he shall not:

                              (i) Own, manage, operate, sell, control or
               participate in the ownership, management, operation, sales or
               control of or be connected in any manner with any business
               engaged in: (A) developing and marketing software in the field of
               customer relationship management; or (B) developing any product
               or providing any service that is substantially the same as, is
               based upon or competes in any material respect with any business
               described in clause (A) of this paragraph;

                              (ii) Recruit, attempt to hire, solicit, assist
               others in recruiting or hiring, or refer to others concerning
               employment, any person who is or was (within one year of
               Employee's termination) an employee of FormerCo, Broadbase, or
               any of Broadbase's other subsidiaries, or induce or attempt to
               induce any such employee to terminate his employment with
               FormerCo, Broadbase, or any of Broadbase's other subsidiaries (as
               the case may be);

                              (iii) Induce or attempt to induce any person or
               entity to curtail or cancel any business or contracts that such
               person or entity had with FormerCo, Broadbase, or any of
               Broadbase's other subsidiaries; or

                              (iv) Contact, solicit or call upon any person or
               entity who was a customer of FormerCo, Broadbase, or any of
               Broadbase's other subsidiaries, on behalf of any other person or
               entity for the purpose of selling or providing any services or
               products of the type normally sold or provided by FormerCo,
               Broadbase, or any of Broadbase's other subsidiaries.

                      (b) The agreements set forth in this Section 8 include
           within their scope all cities, counties, provinces and states of all
           countries in which Broadbase or any of its subsidiaries has engaged
           in development of products or sales or otherwise conducted business
           or selling or licensing efforts at any time during the two years
           prior to the Effective Time or during the Noncompetition Term. The
           Employee acknowledges that the scope and period of restrictions and
           the geographical area to which the restriction imposed in this
           Section 8 shall apply are fair and reasonable and are reasonably
           required for the protection of Broadbase and that Section 8(a)
           accurately describes the business to which the restrictions are
           intended to apply.

                      (c) It is the desire and intent of the parties that the
           provisions of this Section 8 shall be enforced to the fullest extent
           permissible under applicable law. If any provision of this Agreement
           or any part of any such provision is held under any circumstances to
           be invalid or unenforceable by any arbitrator or court of competent
           jurisdiction, then: (i) such provision or part thereof shall, with
           respect to such circumstances and in such jurisdiction, be modified
           by such arbitrator or court to conform to applicable laws so as to be
           valid and enforceable to the fullest possible extent; (ii) the
           invalidity or unenforceability of such provision or part thereof
           under such circumstances and in such jurisdiction shall not affect
           the validity or enforceability of such provision or part thereof
           under any other circumstances or in any other jurisdiction; (iii) the
           invalidity or unenforceability of such provision or part thereof
           shall not affect the validity or enforceability of the remainder of
           such provision or the validity or enforceability of any other
           provision of this Section 8. Each provision of this Section 8 is
           separable from every other provision of this Section 8, and each part
           of each provision of this Section 8 is separable from every other
           part of such provision.

                      (d) The Employee acknowledges that any breach of the
           covenants of Section 8 will result in immediate and irreparable
           injury to Broadbase and, accordingly, consents to the application of
           injunctive relief and such other equitable remedies for the benefit
           of Broadbase as may be appropriate in the event such a breach occurs
           or is threatened. The foregoing remedies shall be in addition to all
           other legal remedies to which Broadbase may be entitled hereunder,
           including, without limitation, monetary damages.

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        9. SUCCESSORS.

           (a) COMPANY'S SUCCESSORS. This Agreement shall be binding upon any
successor (whether direct or indirect and whether by purchase, lease, merger,
consolidation, liquidation or otherwise) to all or substantially all of the
Company's business and/or assets. For all purposes under this Agreement, the
term "Company" shall include any successor to the Company's business and/or
assets which becomes bound by this Agreement.

           (b) EMPLOYEE'S SUCCESSORS. This Agreement and all rights of the
Employee hereunder shall inure to the benefit of, and be enforceable by, the
Employee's personal or legal representatives, executors, administrators,
successors, heirs, distributees, devisees and legatees.

        10. MISCELLANEOUS PROVISIONS.

            (a) NOTICE. Notices and all other communications contemplated by
this Agreement shall be in writing and shall be deemed to have been duly given
when personally delivered or when mailed by U.S. registered or certified mail,
return receipt requested and postage prepaid. In the case of the Employee,
mailed notices shall be addressed to him at the home address which he most
recently communicated to the Company in writing. In the case of the Company,
mailed notices shall be addressed to its corporate headquarters, and all notices
shall be directed to the attention of its Secretary.

            (b) MODIFICATIONS AND WAIVERS. No provision of this Agreement shall
be modified, waived or discharged unless the modification, waiver or discharge
is agreed to in writing and signed by the Employee and by an authorized officer
of the Company (other than the Employee). No waiver by either party of any
breach of, or of compliance with, any condition or provision of this Agreement
by the other party shall be considered a waiver of any other condition or
provision or of the same condition or provision at another time.

            (c) WHOLE AGREEMENT. No other agreements, representations or
understandings (whether oral or written and whether express or implied) which
are not expressly set forth in this Agreement have been made or entered into by
either party with respect to the subject matter hereof. This Agreement, the
Merger Agreement and Plan of Reorganization and the Proprietary Information and
Inventions Agreement contain the entire understanding of the parties with
respect to the subject matter hereof. This Agreement shall supersede in its
entirety the offer letter or other agreement executed by the Employee and
FormerCo and any Restricted Stock Purchase Agreement between the Employee and
FormerCo to the extent inconsistent herewith.

            (d) WITHHOLDING TAXES. All payments made under this Agreement shall
be subject to reduction to reflect taxes or other charges required to be
withheld by law.

            (e) CHOICE OF LAW AND SEVERABILITY. This Agreement shall be
interpreted in accordance with the laws of the State of California (except their
provisions governing the choice of law). If any provision of this Agreement
becomes or is deemed invalid, illegal or unenforceable in any jurisdiction by
reason of the scope, extent or duration of its coverage, then such provision
shall be deemed amended to the extent necessary to conform to applicable law so
as to be valid and enforceable or, if such provision cannot be so amended
without materially altering the intention of the parties, then such provision
shall be stricken and the remainder of this Agreement shall continue in full
force and effect. Should there ever occur any conflict between any provision
contained in this Agreement and any present or future statute, law, ordinance or
regulation contrary to which the parties have no legal right to contract, then
the latter shall prevail but the provision of this Agreement affected thereby
shall be curtailed and limited only to the extent necessary to bring it into
compliance with applicable law. All the other terms and provisions of this
Agreement shall continue in full force and effect without impairment or
limitation.

            (f) ARBITRATION. Any controversy or claim arising out of or relating
to this Agreement or the breach thereof, or the Employee's Employment or the
termination thereof, with the exception of any controversy or claim arising out
of or relating to Section 8, shall be settled by arbitration in Boston,
Massachusetts in accordance with the National Rules for the Resolution of
Employment Disputes of the American

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Arbitration Association. The decision of the arbitrator shall be final and
binding on the parties, and judgment on the award rendered by the arbitrator may
be entered in any court having jurisdiction thereof. The parties hereby agree
that the arbitrator shall enter a written decision and shall be empowered to
enter an equitable decree mandating specific enforcement of the terms of this
Agreement. Any controversy or claim arising out of or relating to Section 8
shall be settled in the appropriate federal or state court in the State of
California. The Company and the Employee hereby consent to personal jurisdiction
of the state and federal courts located in the State of California for any
action or proceeding arising from or relating to this Agreement or relating to
any arbitration in which the parties are participants.

            (g) NO ASSIGNMENT. This Agreement and all rights and obligations of
the Employee hereunder are personal to the Employee and may not be transferred
or assigned by the Employee at any time. The Company may assign its rights under
this Agreement to any entity that assumes the Company's obligations hereunder in
connection with any sale or transfer of all or a substantial portion of the
Company's assets to such entity.

            (h) COUNTERPARTS. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

        IN WITNESS WHEREOF, each of the parties has executed this Agreement, in
the case of the Company by its duly authorized officer, as of the day and year
first above written.

                                          By:
                                             ----------------------------------
                                             MASSOOD ZARRABIAN

                                           BROADBASE SOFTWARE, INC.

                                           By
                                             ----------------------------------

                                           Title:
                                                 ------------------------------

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