Document:

<PAGE>

                                                                   EXHIBIT 10.77

                        @VENTURES FOREIGN FUND III, L.P.

                               MANAGEMENT CONTRACT

     AGREEMENT between @Ventures Foreign Fund III, L.P., a limited partnership
organized under the laws of the State of Delaware (the "Partnership"), and
@Ventures Management, LLC, a limited liability company organized under the laws
of the State of Delaware with its principal office in Andover, Massachusetts
(the "Company"). Capitalized terms used herein and not otherwise defined shall
have the meaning set forth in the Agreement of Limited Partnership of the
Partnership.

     WHEREAS, the Partnership has been formed pursuant to an Agreement of
Limited Partnership (the "Agreement") for the purpose of making investments in
Portfolio Companies; and

     WHEREAS, the Partnership wishes to engage the Company to provide certain
services to further the objectives and purposes of the Partnership, and the
Company is willing to provide such services;

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

     1.   Services to be Rendered by the Company to the Partnership. The Company
will use its best efforts to provide the Partnership with investment
opportunities in Portfolio Securities meeting the requirements of the Agreement.
The Company shall provide such assistance as the Partnership may reasonably
request in identifying, evaluating, structuring, consummating, monitoring and
disposing of potential investments by the Partnership. All investment decisions
shall be made by the general partner of the Partnership on behalf of the
Partnership, and nothing in this contract shall be construed to constitute the
Company an agent of the Partnership.

     2.   Other Activities. It is understood and agreed that the Company may
have management, consulting, service or other contracts with other entities,
including companies in which the Partnership invests. The Partnership agrees
that the Company shall be free to pursue such opportunities, and that the
Partnership shall have no interest therein.

     3.   Payment of Expenses. The Company, so long as this Contract is in
effect, shall be responsible for and shall pay all of its out-of-pocket expenses
and those of the General Partner, including expenses which relate to salaries,
office space, supplies and other facilities of their businesses, except as set
forth in Section 6.5A(4) of the Agreement. It is expected that in the case of
consummated investments, the Company will use its reasonable best efforts to
ensure that all the fees and expenses incurred by the Partnership in connection
with identifying, evaluating, structuring and consummating such investments will
be paid by the Portfolio Company in which the investment was made.

     4. The Management Fee. As full compensation for the services rendered to
the

<PAGE>

Partnership hereunder and the expenses borne by the Company hereunder, during
the period ending four (4) years after the Initial Closing Date (the "Initial
Payment Period"), the Partnership shall pay the Company a management fee equal
to 2% per annum of the aggregate Capital Commitments of all Partners. The
management fee shall be paid semi-annually in advance commencing on the Initial
Closing Date of the Partnership and continuing on the first days of each
February and August thereafter until termination of this Contract. Subsequent to
the end of the Initial Payment Period, the management fee will be equal to 1%
per annum of the aggregate Capital Commitments of all Partners. In addition the
management fee will be reduced by one-half during any period in which the
Partnership is in a Continuity Mode as provided in Section 6.4 of the Agreement
and to the extent that the Partnership is placed in a Continuity Mode during any
period with respect to which the management fee has already been paid, such
reduction shall be reflected as a credit against the management fee to be paid
in the following semi-annual period.

     5.   Set-Offs Against Management Fee. The Company, the General Partner and
their respective Affiliates may receive management, directors', consulting and
other similar fees and compensation from companies in which the Partnership
invests, provided that the amount of such fees and other compensation is
reasonable in relation to the work performed by the Company and bear a
reasonable relation to fees and compensation charged for similar work by third
parties. One half of such fees and other compensation (referred to herein as
"Shared Portfolio Company Fees") shall be credited against the management fee
payable by the Partnership, the Domestic Fund and CMGI in proportion to their
respective aggregate capital commitments. In addition, subject to Section 6.2.0
of the Agreement, any fee, reimbursement or other form of compensation payable
by a third party as a result of the failure to consummate an investment
("Break-up Fees") to the Partnership, the General Partner, the Company or their
respective Affiliates shall be paid as follows: An amount equal to the aggregate
unreimbursed fees and expenses paid by the Partnership, the General Partner, the
Company or their Affiliates which were specific to the transaction giving rise
to such fee shall be paid to each such entity in proportion to the fees and
expenses incurred by it. The balance of any such Break-Up Fee shall be paid to
the Company; provided that one-half of the remaining Break-Up Fee shall be
credited against the management fee payable by the Partnership, the Domestic
Fund and CMGI in proportion to their respective aggregate capital commitments.
To the extent that the sum of such Shared Portfolio Company Fees and Break-up
Fees exceed the management fee payable to the Company for that period, such
excess shall be credited against the management fee payable by the Partnership,
the Domestic Fund and CMGI (in proportion to their respective aggregate capital
commitments) in subsequent periods. In the event that such amounts exceed total
future installments of the management fee, they shall be paid to the
Partnership, the Domestic Fund and CMGI (in proportion to their respective
aggregate capital commitments) and included as Operating Receipts. A
determination of the amount of management fee set-off, if any, shall be made
semi-annually as of June 30 and January 31 of each calendar year and any such
amount shall be credited against the next installment of the management fee
otherwise payable.

     6.   Term and Termination. This Contract shall become effective on its
execution and shall remain in full force and effect continuously thereafter
until the earlier to occur of (i) the date the Partnership is wound up,
liquidated and dissolved, and (ii) the removal of @Ventures Partners III, LLC as
the general partner of the Partnership. This Contract shall automatically
terminate,

                                      2

<PAGE>

without the payment of any penalty, in the event of its assignment by the
Company without the consent of the Partnership.

     7.   Liability and Indemnification. The Company shall not be liable to the
Partnership or any Partner for any act or omission taken or suffered by the
Company in good faith and in the belief that such act or omission is in or is
not opposed to the best interests of the Partnership; provided that such act or
omission is not in violation of this Contract and does not constitute
negligence, misconduct, fraud or a willful violation of the law by the Company.
The Partnership agrees to indemnify, hold harmless and release the Company and
its respective agents, officers, employees, directors and affiliates to the same
extent that such indemnification is provided to the General Partner under
Section 9.3 of the Agreement.

     IN WITNESS WHEREOF, @Ventures Foreign Fund III, L.P. and @Ventures
Management, LLC have caused this agreement to be signed in duplicate as of the
22nd day of December, 1998.

                                        @VENTURES FOREIGN FUND III, L.P.
                                        By: @Ventures Partners III, LLC,
                                            its general partner

                                        By: /s/ Andrew J. Hajducky III
                                            --------------------------
                                        @VENTURES MANAGEMENT, LLC

                                        By: /s/ Andrew J. Hajducky III
                                            --------------------------

                                       3<PAGE>

                                                                   EXHIBIT 10.78

                             CMG @ VENTURES III, LLC

                               MANAGEMENT CONTRACT

          THIS MANAGEMENT CONTRACT, between CMG @ Ventures III, LLC., a limited
liability company organized under the laws of the State of Delaware (the "LLC"),
and @Ventures Management, LLC, a limited liability company organized under the
laws of the State of Delaware (the "Company"), is dated as of September 4, 1998.
Capitalized terms used herein and not otherwise defined shall have the
respective meanings ascribed to them in the Limited Liability Company Agreement
of the LLC (the "Limited Liability Company Agreement").

          WHEREAS, the LLC has been formed pursuant to the Limited Liability
Company Agreement for the purpose of making investments in Portfolio Companies;
and

          WHEREAS, the LLC wishes to engage the Company to provide certain
services to further the objectives and purposes of the LLC, and the Company is
willing to provide such services.

          NOW THEREFORE, in consideration of the mutual covenants contained
herein, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereby agree as
follows:

          1. Services to be Rendered by the Company to the LLC. The Company will
provide the LLC with investment opportunities in Portfolio Securities meeting
the requirements of the Limited Liability Company Agreement. The Company shall
provide such assistance as the LLC may reasonably request in identifying,
evaluating, structuring, consummating, monitoring and disposing of potential
investments by the LLC. All investment decisions shall be made by the Managing
Member of the LLC on behalf of the LLC, and nothing in this contract shall be
construed to constitute the Company an agent of the LLC.

          2. Other Activities. It is understood and agreed that the Company may
have management, consulting, service or other contracts with other entities,
including companies in which the LLC invests. The LLC agrees that the Company
shall be free to pursue such opportunities~ and that the LLC shall have no
interest therein.

          3. Payment of Expenses. The Company, so long as this Contract is in
effect, shall be responsible for and shall pay all of its out-of-pocket expenses
and those of the Managing Member, including expenses which relate to salaries,
office space supplies and other facilities of their businesses. It is expected
that in the case of consummated investments, the Company will use its reasonable
best efforts to ensure that all the fees and expenses incurred by the LLC in
connection with identifying, evaluating, structuring and consummating such
investments will be paid by the Portfolio Company in which the investment was
made.

          4. The Management Fee. As full compensation for the services rendered
to the LLC hereunder and the expenses borne by the Company hereunder, during
the period ending four (4)

<PAGE>

years after the date hereof (the "Initial Payment Period"), the LLC shall pay
the Company a management fee equal to 2% per annum of the aggregate Capital
Commitments of all Members (such Capital Commitments being in the aggregate
amount of $55,762,673). The management fee shall be paid semi-annually in
advance commencing on the date hereof and continuing on the first days of each
February and August thereafter until termination of this Contract. Subsequent to
the end of the Initial Payment Period, the management fee will be equal to 1%
per annum of the aggregate Capital Commitments of all Members. The management
fee will be reduced by one-half during any period in which the Domestic Fund is
in a Continuity Mode as provided in Section 6.4 of the Domestic Fund Agreement
and to the extent that the Domestic Fund is placed in a Continuity Mode during
any period with respect to which the management fee has already been paid, such
reduction shall be reflected as a credit against the management fee to be paid
in the following semi-annual period.

          5. Set-Offs Against Management Fee. The Company, the Managing Member
and their respective Affiliates may receive management, directors', consulting
and other similar fees and compensation from companies in which the LLC invests,
provided that the amount of such fees and other compensation is reasonable in
relation to the work performed by the Company and bear a reasonable relation to
fees and compensation charged for similar work by third parties. One-half of
such fees and other compensation (referred to herein as "Shared Portfolio
Company Fees") shall be credited against the management fee payable by the LLC
and the Funds in proportion to their respective aggregate capital commitments.
In addition, any Break-up Fee paid to the LLC, the Managing Member, the Company
or their respective Affiliates shall be paid as follows: An amount equal to the
aggregate unreimbursed fees and expenses paid by the LLC, the Managing Member,
the Company or their Affiliates which were specific to the transaction giving
rise to such Break-Up Fee shall be paid to each such entity in proportion to the
fees and expenses incurred by it. The balance of any such Break-Up Fee shall be
paid to the Company; provided that one-half of the remaining Break-Up Fee shall
be credited against the management fee payable by the LLC and the Funds in
proportion to their respective aggregate capital commitments. To the extent that
the sum of such Shared Portfolio Company Fees and Break-up Fees exceed the
management fee payable to the Company for any period, such excess shall be
credited against the management fee payable by the LLC and the Funds (in
proportion to their respective aggregate capital commitments) in subsequent
periods. In the event that such amounts exceed total future installments of the
management fee, they shall be paid to the LLC and the Funds (in proportion to
their respective aggregate capital commitments) and included as operating
receipts. A determination of the amount of the management fee set-off, if any,
shall be made semi-annually as of June 30 and January 31 of each calendar year
and any such amount shall be credited against the next installment of the
management fee otherwise payable.

          6. Term and Termination. This Contract shall become effective on the
date hereof and shall remain in full force and effect continuously thereafter
until the earlier to occur of (i) the date the LLC is wound up, its assets are
liquidated and it is dissolved, and (ii) the removal of @Ventures Partners III,
LLC as the general partner of the Domestic Fund. This Contract shall
automatically terminate, without the payment of any penalty, in the event of its
assignment by the Company without the consent of the LLC.

          7. Liability and Indemnification. The Company shall not be liable to
the LLC or any

                                       2

<PAGE>

Member for any act or omission taken or suffered by the Company in good faith
and in the belief that such act or omission is in or is not opposed to the best
interests of the LLC; provided that such act or omission is not in violation of
this Contract and does not constitute negligence, misconduct, fraud or a willful
violation of the law by the Company. The LLC agrees to indemnify, hold harmless
and release the Company and its respective agents, officers, employees,
directors and affiliates to the same extent that such indemnification is
provided to the Managing Member under Section 6.03 of the Limited Liability
Company Agreement.

          IN WITNESS WHEREOF, CMG@Ventures III, LLC and @Ventures Management,
LLC have caused this Contract to be executed, in one or more counterparts as of
the date first above written.

                            CMG @ VENTURES III, LLC

                            By: @Ventures Partners III, LLC, its Managing Member

                                By: /s/ Andrew J. Hajducky III
                                    --------------------------
                                    Name: Andrew J. Hajducky III
                                    Title: Managing Member

                            @VENTURES MANAGEMENT, LLC

                                By: /s/ Andrew J. Hajducky III
                                    --------------------------
                                Name: Andrew J. Hajducky III
                                Title: Managing Member

                                       3

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00044-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00044-of-00352.parquet"}]]