Document:

<PAGE>
                                                                   Exhibit 10.49

                       AMENDMENT TO EMPLOYMENT AGREEMENT
                       ---------------------------------

     This Amendment to the Employment Agreement (defined below) is made and
entered into as of the 22nd day of May, 2001, by and between Interliant, Inc., a
Delaware corporation, having a place of business at Two Manhattanville Road,
Purchase, New York 10577 ("Employer"), and, Leonard J. Fassler, having an
address at 7 Old Woods Drive, Harrison, NY  10528 ("Employee").

                                  WITNESSETH:
                                  -----------

     WHEREAS, Employee is a Co-Chairman and director of Employer;

     WHEREAS, Employer and Employee entered into an Employment Agreement dated
as of January 1, 1999 ("Employment Agreement") setting forth the terms of the
employment relationship of Employee as Co-Chairman of Employer;

     WHEREAS, the term of the Employment Agreement has been automatically
extended beyond December 31, 1999, and by a prior amendment between the parties,
is presently month-to-month;

     WHEREAS, the parties desire to further amend the Employment Agreement,
particularly the term and the compensation provided thereunder, in accordance
with the terms and conditions set forth in this Amendment.

     NOW, THEREFORE, in consideration of the foregoing and the mutual promises
and covenants herein contained, it is agreed as follows:

     1.   TERM
          ----

          Employee's employment hereunder shall be for an term continuing as of
the date hereof and ending on May 31, 2002 ("Extended Term").  The Agreement
shall be automatically extended from year to year thereafter unless either party
gives not less than three (3) months prior written notice to the other that such
party elects to have the Agreement terminated effective at the end of the
Extended Term or then current renewal term, provided, however, that the
compensation to be paid to Employee during any such renewal period shall be the
same as provided in the Employment Agreement without giving effect to the
changes made by this Amendment, unless the parties otherwise agree in writing.
<PAGE>

2.  COMPENSATION
    ------------

          Commencing June 1, 2001, in lieu of any cash compensation provided in
Section 3 (a) of the Employment Agreement, as compensation for the performance
of his duties on behalf of Employer during the Extended Term, Employer shall
deliver to Employee, 180,000 shares of Employer's common stock, par value $.01,
which shares shall be unregistered.

3.  SEVERANCE
    ---------

     Section 6 of the Employment is hereby amended by providing that the first
sentence of the first paragraph thereof shall not be applicable if such
termination of employment of Employee occurs prior to the end of the Extended
Term.

4.  ENTIRE AGREEMENT; MODIFICATION
    ------------------------------

          Except as expressly amended hereby, the Employment Agreement shall
remain in full force and effect as originally drafted. This Agreement contains
the entire agreement between the parties relating to the subject matter hereof.
No modification of this Agreement shall be valid unless it is made in writing
and signed by the parties hereto.

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement the day
and year first above written.

                                          INTERLIANT, INC.,
                                          Employer

                                          By: /s/s Bruce Graham
                                              -------------------
                                              Bruce Graham
                                              Chief Executive Officer and
                                              President

                                          Employee:

                                          /s/ Leonard J. Fassler
                                          ----------------------
                                          Leonard J. Fassler<PAGE>

                                                                   Exhibit 10.50

                       AMENDMENT TO CONSULTING AGREEMENT
                       ---------------------------------

  This Amendment to the Consulting Agreement (defined below) is made and entered
into as of the 22nd day of May, 2001, by and between Interliant, Inc., a
Delaware corporation, having a place of business at Two Manhattanville Road,
Purchase, New York 10577 (the "Company") and Intensity Ventures, Inc. (the
"Consulting Company").

  WHEREAS, Bradley A. Feld, principal of the Consulting Company is a Co-Chairman
and director of the Company, and the person principally rendering the services
of the Consulting Company under the Consulting Agreement;

     WHEREAS, the Company and the Consulting Company entered into a Consulting
Agreement dated as of January 1, 1999 ("Consulting Agreement") setting forth the
terms of the consulting relationship between the parties;

     WHEREAS, the term of the Consulting Agreement has been automatically
extended beyond December 31, 1999, and by a prior amendment between the parties,
is presently month-to-month;

     WHEREAS, the parties desire to further amend the Consulting Agreement,
particularly the term and the compensation provided thereunder, in accordance
with the terms and conditions set forth in this Amendment.

  NOW, THEREFORE, in consideration of the mutual covenants set forth herein, the
Company and the Consulting Company hereby agree as follows:

  1.  TERM
      ----

          The term of the Consulting Agreement shall be extended for a term
continuing as of the date hereof and ending on May 31, 2002 ("Extended Term").
The Agreement shall be automatically extended from year to year thereafter
unless either party gives not less than three (3) months prior written notice to
the other that such party elects to have the Agreement terminated effective at
the end of the Extended Term or then current renewal term, provided, however,
that the compensation to be paid to the Consulting Company during any such
renewal period shall be the same as provided in the Consulting Agreement without
giving effect to the changes made by this Amendment, unless the parties
otherwise agree in writing.

2.      COMPENSATION
        ------------

          Commencing June 1, 2001, in lieu of any cash compensation provided in
Section 4 of the Consulting Agreement, as compensation for the performance of
the Consulting Company's services during the Extended Term, the Company shall
deliver to the Consulting Company, 180,000 shares of the Company's common stock,
par value $.01, which shares shall be unregistered.
<PAGE>

3.  SEVERANCE
    ---------

          Section 7 of the Consulting Agreement is hereby amended by providing
that the first sentence of the first paragraph thereof shall not be applicable
if such termination of the Consulting Agreement occurs prior to the end of the
Extended Term.

4.  ENTIRE AGREEMENT; MODIFICATION
    ------------------------------

          Except as expressly amended hereby, the Consulting Agreement shall
remain in full force and effect as originally drafted. This Agreement contains
the entire agreement between the parties relating to the subject matter hereof.
No modification of this Agreement shall be valid unless it is made in writing
and signed by the parties hereto.

IN WITNESS WHEREOF, the parties have duly executed this Agreement as of the date
first above written.

                                    INTERLIANT, INC.

                                    By /s/ Bruce Graham
                                           ----------------
                                           Bruce Graham
                                           President and Chief Executive Officer

                                    INTENSITY VENTURES, INC.

                                    By /s/ Bradley A. Feld
                                       -------------------
                                       Bradley A. Feld
                                       President<PAGE>

                                                               EXHIBIT 10.38 (k)

                   ELEVENTH AMENDMENT AND WAIVER TO AMENDED

                         AND RESTATED CREDIT AGREEMENT
                         -----------------------------

     ELEVENTH AMENDMENT AND WAIVER, dated as of August 10, 2001 (this
"Amendment"), to the Amended and Restated Credit Agreement referred to below by
 ---------
and among GENERAL ELECTRIC CAPITAL CORPORATION, a Delaware corporation
("Lender"), and BUTLER SERVICE GROUP, INC., a New Jersey corporation
  ------
("Borrower"), BUTLER INTERNATIONAL, INC., a Maryland corporation ("Parent"), and
  --------                                                         ------
the "Subsidiaries" signatory hereto.

                              W I T N E S S E T H
                              -------------------

     WHEREAS, Lender and Borrower are parties to that certain Amended and
Restated Credit Agreement, dated as of November 7, 1997 (as amended,
supplemented or otherwise modified prior to the date hereof, the "Credit
                                                                  ------
Agreement"); and
---------

     WHEREAS, Lender has agreed to amend the Credit Agreement and to waive the
violation of the Fixed Charge Coverage Ratio and Interest Coverage Ratio
covenants contained in the Credit Agreement in the manner, and on the terms and
conditions, provided for herein.

     NOW THEREFORE, in consideration of the premises and for other good and
valuable consideration, the receipt, adequacy and sufficiency of which are
hereby acknowledged, the parties to this Amendment hereby agree as follows:

          1.   Definitions. Capitalized terms not otherwise defined herein shall
               -----------
have the meanings ascribed to them in the Credit Agreement.

          2.   Amendments.
               ----------

               A.   Amendment to Section 7.1(n). The word "or" after the
                    ---------------------------
semicolon in Section 7.1(n) of the Credit Agreement is hereby deleted as of the
             --------------
Amendment Effective Date.

               B.   Amendment to Section 7.1(o). The period in Section 7.1(o) of
                    ---------------------------                --------------
the Credit Agreement is hereby deleted as of the Amendment Effective Date and ";
or" is inserted in lieu thereof.

               C.   Amendment to add Section 7.1(p). The following new
                    -------------------------------
sub-paragraph is hereby inserted after Section 7.1(o) of the Credit Agreement:
                                       --------------
<PAGE>

          "(p) the failure of Borrower to obtain 30 days prior to the expiration
          of the Collateral Letter of Credit a replacement letter of credit,
          which letter of credit shall be in form and substance acceptable to
          Lender in its discretion."

               D.   Amendment to Annex A. The definition of "Borrowing Base" in
                    --------------------
Annex A to the Credit Agreement is hereby deleted in its entirety and the
-------
following is inserted in lieu thereof:

          "'Borrowing Base' means on any date of determination thereof, an
            --------------
          amount equal to the sum of (A) eighty-five percent (85%) of Eligible
          Accounts, (B) seventy-five percent (75%) of Eligible Pending Accounts
          Receivable and Fixed Contract Accounts Receivable (up to the maximum
          amount of $17,000,000 in the aggregate), (C) forty percent (40%) of
          Eligible Inventory (valued on a first in, first out basis) (up to the
          maximum amount of $2,000,000 in the aggregate), and (D) one hundred
          percent (100%) of the undrawn amount of the Collateral Letter of
          Credit."

                 (i)     The following new definition is hereby inserted in its
alphabetical order in Annex A to the Credit Agreement:
                      -------

          "'Collateral Letter of Credit' shall mean that certain standby letter
            ---------------------------
          of credit, number 7405556, issued by Bank of America, N.A. in favor of
          Lender or any other replacement or substitute letter(s) of credit
          issued favor of Lender by an issuing bank acceptable to Lender."

          3.   Waiver. Lender hereby waives as of the Amendment Effective Date
               ------
all Events of Default under Section 8.1(b) of the Credit Agreement solely
                            --------------
arising out of the failure of the Parent and its Subsidiaries to maintain, on a
consolidated basis, the minimum Fixed Charge Coverage Ratio and the minimum
Interest Coverage Ratio required by Section 6.2(r) of the Credit Agreement and
                                    --------------
paragraph (c) and paragraph (d), respectively, of Schedule 6.2(r) to the Credit
-------------     -------------                   ---------------
Agreement for the Fiscal Quarter ended June 30, 2001. Lender hereby waives as of
the Amendment Effective Date all Events of Default under Section 2.1(a)(vi) of
                                                         ------------------
the Credit Agreement solely arising out of the failure of Borrower to comply
with the requirement that Overadvances not exceed $3,000,000 in the aggregate at
any time.

          4.   Representations and Warranties. To induce Lender to enter into
               ------------------------------
this Amendment, Borrower and each Guarantor hereby represents and warrants that:

               A.   The execution, delivery and performance of this Amendment
and the performance of the Credit Agreement by Borrower and each Guarantor: (i)
are within its corporate powers; (ii) has been duly authorized by all necessary
corporate and shareholder action; and (iii) is not in contravention of any
provision of its certificate or articles of incorporation or other
organizational documents.

               B.   This Amendment has been duly executed and delivered by or on
behalf of Borrower and each Guarantor.

               C.   Each of this Amendment and the Credit Agreement constitutes
a legal, valid and binding obligation of Borrower and each Guarantor enforceable
against Borrower
<PAGE>

in accordance with its terms, except as enforceability may be limited by
applicable bankruptcy, insolvency, reorganization, moratorium or similar laws
affecting creditors' rights generally and by general equitable principles
(whether enforcement is sought by proceedings in equity or at law).

               D.   No Default (other than those waived pursuant hereto) has
occurred and is continuing both before and after giving effect to this
Amendment.

               E.   No action, claim or proceeding is now pending or, to the
knowledge of Borrower and each Guarantor, threatened against Borrower and each
Guarantor, at law, in equity or otherwise, before any court, board, commission,
agency or instrumentality of any federal, state, or local government or of any
agency or subdivision thereof, or before any arbitrator or panel of arbitrators,
which challenges Borrower's or any Guarantor's right, power, or competence to
enter into this Amendment or, to the extent applicable, perform any of its
obligations under this Amendment, the Credit Agreement or any other Loan
Document, or the validity or enforceability of this Amendment, the Credit
Agreement or any other Loan Document or any action taken under this Amendment,
the Credit Agreement or any other Loan Document.

               F.   The representations and warranties of Borrower and each
Guarantor contained in the Credit Agreement and each other Loan Document shall
be true and correct on and as of the Amendment Effective Date with the same
effect as if such representations and warranties had been made on and as of such
date, except that any such representation or warranty which is expressly made
only as of a specified date need be true only as of such date.

          5.   No Other Amendment/Waiver; Reservation of Rights.
               ------------------------------------------------

               A.   Except as expressly provided in Section 2 hereof, the Credit
Agreement shall be unmodified and shall continue to be in full force and effect
in accordance with its terms. Except as expressly provided in Section 3 hereof,
this Amendment shall not be deemed a waiver of any term or condition of any Loan
Document and shall not be deemed to prejudice any right or rights which Lender
may now have or may have in the future under or in connection with any Loan
Document or any of the instruments or agreements referred to therein, as the
same may be amended from time to time.

               B.   Borrower and each Guarantor acknowledges that in accordance
with Section 2.1(a)(vi) of the Credit Agreement Lender has no obligation to
     ------------------
continue to make Overadvances, Working Capital Advances or Acquisition Loan
Advances or incur Letter of Credit Obligations under the Credit Agreement at any
time that an Overadvance exists, and Lender may continue to make Overadvances,
Working Capital Advances or Acquisition Loan Advances or incur Letter of Credit
Obligations in the future, which Overadvances, Working Capital Advances or
Acquisition Loan Advances or Letter of Credit Obligations are in Lender's sole
and absolute discretion.
<PAGE>

          6.   Outstanding Indebtedness; Amendment of Claims. Borrower and each
               ---------------------------------------------
Guarantor hereby acknowledges and agrees that as of the date hereof the
aggregate outstanding principal amount of the Working Capital Revolving Loan is
$51,891,582.15 and the Acquisition Loan is $22,742,829.00, respectively.
Borrower and each Guarantor hereby waives, releases, remises and forever
discharges Lender and each other Indemnitee from any and all claims of any kind
or character, known or unknown, which Borrower ever had, now has or might
hereafter have against Lender which relates, directly or indirectly, to any acts
or omissions of Lender or any other Indemnitee on or prior to the date hereof.

          7.   Expenses. Borrower hereby reconfirms its obligations pursuant to
               --------
Section 8.1 of the Credit Agreement to pay and reimburse Lender for all
reasonable out-of-pocket expenses (including, without limitation, reasonable
fees of counsel) incurred in connection with the negotiation, preparation,
execution and delivery of this Amendment and all other documents and instruments
delivered in connection herewith.

          8.   Effectiveness. This Amendment shall become effective as of the
               -------------
date hereof (the "Amendment Effective Date") only upon satisfaction in full in
                  ------------------------
the judgment of the Lender of each of the following conditions on or prior to
August ___, 2001:

               A.   Amendment. Lender shall have received two original copies of
                    ---------
this Amendment duly executed and delivered by Lender, Borrower and each
Guarantor.

               B.   Collateral Letter of Credit. Lender shall have received an
                    ---------------------------
original letter of credit issued by a financial institutional acceptable to
Lender, which letter of credit shall name Lender as beneficiary thereunder,
shall be issued for a face amount of not less than $1,500,000 and shall
otherwise be in form and substance acceptable to Lender in its sole discretion.

               C.   Representations and Warranties. The representations and
                    ------------------------------
warranties of Borrower and each Guarantor contained in this Amendment shall be
true and correct on and as of the Amendment Effective Date.

               D.   Amendment and Restatement. On or before August 31, 2001,
                    -------------------------
Borrower, Guarantors and Lender shall amend and restate the Credit Agreement (as
amended by this Amendment) and the other Loan Documents, which shall be in form
and substance acceptable to Lender, based upon and subject to the provisions of
that certain Revised Summary of Proposed Terms and Conditions, dated July 31,
2001, as the same may further be amended, modified or supplemented from time to
time by Lender, Borrower and Guarantors.

          9.   GOVERNING LAW. THIS WAIVER SHALL BE GOVERNED BY, AND INTERPRETED
               -------------
IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK.
<PAGE>

          10.  Counterparts. This Amendment may be executed by the parties
               ------------
hereto on any number of separate counterparts and all of said counterparts taken
together shall be deemed to constitute one and the same instrument.

                           (SIGNATURE PAGE FOLLOWS)
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed and delivered as of the day and year first above written.

                                             Borrower:
                                             --------

                                             BUTLER SERVICE GROUP, INC.

                                             By: /s/ Michel C. Hellriegel
                                                --------------------------------
                                             Name: Michael C. Hellriegel
                                             Title: Sr. VP - Finance

                                             Parent:

                                             BUTLER INTERNATIONAL, INC.

                                             By: /s/ Michel C. Hellriegel
                                                --------------------------------
                                             Name: Michael C. Hellriegel
                                             Title: Sr. VP - Finance

                                             Subsidiaries:

                                             BUTLER TECHNOLOGY SOLUTIONS, INC.

                                             By: /s/ Michel C. Hellriegel
                                                --------------------------------
                                             Name: Michael C. Hellriegel
                                             Title: Sr. VP - Finance

                                             BUTLER TELECOM, INC.

                                             By: /s/ Michel C. Hellriegel
                                                --------------------------------
                                             Name: Michael C. Hellriegel
                                             Title: Sr. VP - Finance

                                             BUTLER SERVICES, INC.

                                             By: /s/ Michel C. Hellriegel
                                                --------------------------------
                                             Name: Michael C. Hellriegel
                                             Title: Sr. VP - Finance

                                             DATA PERFORMANCE, INC.
<PAGE>

                                             By: /s/ Michel C. Hellriegel
                                                --------------------------------
                                             Name: Michael C. Hellriegel
                                             Title: Sr. VP - Finance

                                             Lender:
                                             ------

                                             GENERAL ELECTRIC CAPITAL
                                             CORPORATION

                                             By: /s/ Michael Lustbader
                                                --------------------------------
                                             Name: Michael Lustbader
                                             Title: Duly Authorized Signature

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