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                                                                    Exhibit 10.6

          Confidential Materials omitted and filed separately with the
        Securities and Exchange Commission. Asterisks denote omissions.

                         HYPROTECH UK LICENSE AGREEMENT

     THIS HYPROTECH LICENSE AGREEMENT (the "AGREEMENT") is made and entered into
as of this 23rd day of December, 2004 (the "EFFECTIVE DATE"), by and between
Hyprotech UK Ltd., a limited liability company organized under the laws of
England ("ASPENTECH"), and Honeywell Control Systems Limited, a company
organized under the laws of the United Kingdom ("HONEYWELL"). AspenTech and
Honeywell are each referred to herein as a "PARTY" and collectively as the
"PARTIES." All capitalized terms that are not otherwise defined herein shall
have the respective meanings ascribed to such terms in the Purchase and Sale
Agreement dated as of October 6, 2004 by and among AspenTech, certain of its
affiliates, and Honeywell (the "PURCHASE AGREEMENT").

     WHEREAS, AspenTech and Honeywell have entered into the Purchase Agreement
pursuant to which AspenTech has agreed, subject to the terms and conditions set
forth therein, to transfer to Honeywell all of its right, title and interest in
and to certain Engineering Software Assets, including the Assigned Intellectual
Property, effective as of the Closing Date subject to the non-exclusive licenses
set forth in this Agreement; and

     WHEREAS, in connection with the transactions contemplated by the Purchase
Agreement, AspenTech desires to retain certain rights and licenses with respect
to IT Property and Assigned Intellectual Property as set forth herein.

     NOW THEREFORE, in consideration of the mutual agreements and covenants set
forth herein, Honeywell and AspenTech hereby agree as follows:

1.   DEFINITIONS

     For purposes of this Agreement, the following capitalized terms shall have
the following meanings:

     1.1   "ASPENTECH RELATED PARTY" means (a) any sublicensee, customer,
distributor, reseller, OEM, joint venturer, partner, agent or direct or indirect
sales channels of AspenTech, any of its Affiliates, or any of the foregoing
parties, or (b) any other person or entity with which AspenTech or any of its
Affiliates has a continuing business relationship; PROVIDED, HOWEVER, that the
following persons and entities shall not be considered to be AspenTech Related
Parties: (i) [**] and its successors or assigns, and (ii) for purposes of the
[**].

     1.2   "CONFIDENTIAL LICENSED PROPERTY" means Licensed Property that
AspenTech or its Affiliates treated as confidential as of the Effective Date.

     1.3   "EXISTING OTS CONTRACTS" means (a) each Retained AspenTech Contract
(as defined in the Subcontract Agreement), (b) each Assigned Contract for which
customer consent for assignment is not obtained until such time as such customer
consent has been obtained, (c)

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each contract set forth on Schedule 1.1(b)(ii) to the Purchase Agreement (other
than Multi-Product Agreements) and (d) any change orders to any of the foregoing
agreements made in the ordinary course consistent with AspenTech's past
practice.

     1.4   "HYPROTECH PROPERTY" means all of AspenTech's right, title and
interest (immediately prior to the Closing) in and to all IT Property other than
the Operator Training Property and the MUSIC Product. For purpose of clarity,
the Hyprotech Property includes, without limitation, the Hyprotech Products and
Genesis Project Materials.

     1.5   "HYPROTECH IP" means all of AspenTech's right, title and interest
(immediately prior to the Closing) in and to all Intellectual Property embodied
in the IT Property (including, without limitation, the Hyprotech Property),
exclusive of the Operator Training IP and the MUSIC IP.

     1.6   "IP MATERIAL ADVERSE EFFECT" means any material breach or violation
by an AspenTech Related Party of a Sublicense Agreement (as defined in Section
2.3 below) or an infringement or misappropriation by an AspenTech Related Party
of the Licensed Property and/or Licensed IP that, in AspenTech's reasonable
judgment, gives rise to: (i) a threat of abandonment of, or (ii) an impingement
upon the validity or enforceability of, in each case, any item of Licensed
Property and/or Licensed IP.

     1.7   "INTELLECTUAL PROPERTY" means all (a) registered and unregistered
statutory and common law copyrights, whether published or unpublished, works of
authorship, and all registrations, applications for registration, and renewals
thereof, (b) trade secrets, know-how, confidential information, processes and
formulas, (c) patents and patent applications, invention disclosures, industrial
or utility models, and inventors certificates throughout the world and all
inventions contained therein, all provisional, divisional, continuation,
continuation-in-part, or substitute applications based on the foregoing, any
patents that shall issue on any of the foregoing or on any improvements,
reissues, or reexaminations thereof, and patents and patent applications,
including, without limitation, to patents of importation, improvement, or
addition, utility models, and inventors certificates, corresponding in whole or
in part to any of the above-described patent and patent applications that are
issued, filed, or to be filed in any and all countries, and any patents that
shall subsequently issue therefrom including any renewals, divisions, reissues,
continuations, or extensions thereof, (d) data rights and information, and (e)
other intellectual property and proprietary rights whether patented or
unpatented, or registered or unregistered.

     1.8   "LICENSED IP" means the Operator Training IP, MUSIC IP, and the
Hyprotech IP.

     1.9   "LICENSED PROPERTY" means the Operator Training Property, MUSIC
Product and Hyprotech Property.

     1.10  "MAJOR PRODUCT LINE" means the Licensed Property that comprises or
relates primarily to each of the following five product families: (i) HYSYS and
related options and extensions, including ComThermo, (ii) Batch processing
products (i.e., BDK), (iii) Heat exchanger products (i.e., TASC, ACOL, APLE,
FIHR, etc.), (iv) Conceptual engineering products (i.e. HX-NET, Distil), and (v)
Hydraulics (i.e., all the ProFES and related products).

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     1.11  "MAJOR PRODUCT LINE IP" means the Licensed IP in and to each Major
Product Line.

     1.12  "MAJOR PRODUCT LINE ACQUIRER" means an acquirer of all or
substantially all of the business of AspenTech and its Affiliates that relates
to any Major Product Line.

     1.13  "MUSIC IP" means all of AspenTech's right, title and interest
(immediately prior to the Closing) in and to all Intellectual Property embodied
in the MUSIC Product.

     1.14  "MUSIC PRODUCT" means all of AspenTech's right, title and interest
(immediately prior to Closing) in and to the (a) computer programs (including
code in source code, object code and executable forms), interfaces, tools
(including, without limitation, internal development and migration tools),
development environments, flow charts, libraries, modules, add-ons, patches, bug
fixes, object libraries, test programs, regression test software, proprietary
programming languages, enhancements, customizations, scripts, utilities,
databases, data and algorithms constituting or embodied in the Assigned Products
known as "MUSIC", and the interfaces, programs and modules related thereto that
are set forth in Schedule 1.1(a)(i)(B) of the Purchase Agreement; and (b)
Documentation and Records for the MUSIC product.

     1.15  "OBJECT CODE FORM" means a form of software code resulting from the
translation or processing of software in Source Code Form by a computer into
machine language or intermediate code or other executable code, which thus is in
a form that would not be convenient to human understanding of the program.

     1.16  "OPERATOR TRAINING IP" means all of AspenTech's right, title and
interest (immediately prior to the Closing) in and to all Intellectual Property
embodied in the Operator Training Property, excluding the MUSIC IP.

     1.17  "OPERATOR TRAINING PROPERTY" means all of AspenTech's right, title
and interest (immediately prior to Closing) in and to the (a) Operator Training
Products and the (b) Documentation and Records related solely to the Operator
Training Products, excluding in all cases the MUSIC Product.

     1.18  "OTS FIELD OF USE" means the provision of Restricted Services.

     1.19  "OTS TERM" means the period starting as of the Effective Date and
ending upon the expiration or termination of all obligations of AspenTech and
its Affiliates under all of the Existing OTS Contracts.

     1.20  "SOFTWARE SUPPORT AGREEMENT" means the agreement entered into by the
Parties simultaneously herewith and entitled the Software Support Agreement.

     1.21  "SOURCE CODE FORM" means a form of software code in which a computer
program's logic is easily deduced by a human being with skill in the art.

     1.22  "SUBCONTRACT AGREEMENT" means the Subcontract Agreement entered into
by the Parties simultaneously herewith.

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     1.23  "THIRD PARTY" means a person or entity other than AspenTech or its
Affiliates.

     1.24  "THIRD-PARTY PRODUCT" means a product that is not marketed, licensed,
or sold by (a) AspenTech or any of its Affiliates (or any of their respective
permitted assignees or permitted successors), distributors, resellers, OEMs,
agents, or other indirect sales channels of any of the foregoing persons or
entities, or (b) a joint venture or partnership of AspenTech, or other Third
Party with which AspenTech or any of its Affiliates has a continuing business
relationship for the development, marketing, sales, or distribution of such
product.

2.   LICENSE

     2.1   LICENSED RIGHTS.

           a.   GENERAL LICENSE TO HYPROTECH IP. AspenTech retains under the
Hyprotech IP and the Hyprotech Property a worldwide, non-exclusive,
royalty-free, perpetual, irrevocable right and license, with the right to
sublicense solely as set forth in Sections 2.2 and 2.3 below (provided that
AspenTech shall remain subject to the restrictions set forth in Sections 2.1(e),
2.5(a), 5.1, 5.2 and 5.4 below in granting any such sublicense), (A) to make,
have made, use, have used, sell, have sold, offer to sell, and import any
product or provide any service covered by the Hyprotech IP and exercise any
other rights in the Hyprotech IP in connection therewith, and (B) to copy,
modify, enhance, prepare derivative works of, improve, maintain, support,
develop, demonstrate, promote, distribute and transmit the Hyprotech Property
(in Source Code Form, Object Code Form or any other applicable form) and any
derivative work thereof, in each case, for any purpose.

           b.   FIELD LICENSE TO MUSIC. AspenTech retains under the MUSIC
Product and MUSIC IP, a worldwide, non-exclusive, royalty-free, perpetual,
irrevocable right and license, with the right to sublicense solely as set forth
in Sections 2.2 and 2.3 below (provided that AspenTech shall remain subject to
the restrictions set forth in Sections 2.1(e), 2.5(a), 5.1, 5.2 and 5.4 below in
granting any such sublicense), (A) to make, have made, use, have used, sell,
have sold, offer to sell, and import any product or provide service covered by
the MUSIC IP and exercise any other rights in the MUSIC IP in connection
therewith, in each case, solely outside of the OTS Field of Use, and (B) to
copy, modify, enhance, prepare derivative works of, improve, maintain, support,
develop, demonstrate, promote, distribute and transmit the MUSIC Product (in
Source Code Form, Object Code Form or any other applicable form) and any
derivative work thereof, in each case, solely for use outside of the OTS Field
of Use.

           c.   PROJECT LICENSE TO OPERATOR TRAINING PRODUCTS. During the OTS
Term, AspenTech retains under the Operator Training IP and Operator Training
Property, a worldwide, non-exclusive, royalty-free right and license, with the
right to sublicense, solely as set forth in Sections 2.2 and 2.3 below (provided
that AspenTech shall remain subject to the restrictions set forth in Sections
2.1(e), 2.5(a), 5.1, 5.2 and 5.4 below in granting any such sublicense), to
exercise any rights in the Operator Training IP and the Operator Training
Property (in Source Code Form, Object Code Form or any other applicable form)
solely in connection with performing the Existing OTS Contracts which Existing
OTS Contracts shall not be renewed and shall not be amended (other than change
orders made in the ordinary course of business

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consistent with AspenTech's past practice). The rights and licenses set forth in
this Section 2.1(c) shall terminate upon the termination of the OTS Term.

           d.   NO UPDATES. For avoidance of doubt, the licenses set forth in
this Section 2.1 are limited to the Licensed Property and Licensed IP existing
as of the Effective Date and do not include products relating thereto or
Intellectual Property therein that are, in each case, developed by or for
Honeywell after the Effective Date.

           e.   DISCLOSURE. Subject to the terms of this Agreement, the rights
and licenses set forth in Sections 2.1(a) and (b) and 2.2 include the right to
disclose the Source Code Form of the applicable Licensed Property, PROVIDED THAT
such disclosure is in accordance with the obligations and restrictions set forth
in Sections 2.2 and 2.3 of this Agreement and the confidentiality obligations
and restrictions set forth in Section 5.1, 5.2, and 5.4 of this Agreement.

           f.   IRREVOCABILITY. Notwithstanding anything to the contrary in this
Agreement or otherwise, the rights and licenses set forth under Sections 2.1(a),
2.1(b) and 2.2 hereof shall be irrevocable and non-terminable, and such rights
and licenses shall survive and shall remain irrevocable and non-terminable
regardless of any breach or termination of this Agreement for any reason.

     2.2   SUBLICENSING. AspenTech shall have the right to grant licenses and/or
sublicenses (with the rights of the licensees and/or sublicensees to grant
further sublicenses) of any of the rights and licenses set forth in Sections
2.1(a), 2.1(b) or 2.1(c); PROVIDED, HOWEVER, that AspenTech shall not have the
right to grant to any Third Party (a) a sublicense of its rights in the
Hyprotech Products or MUSIC Products in Source Code Form that authorizes or
grants rights to such Third Party to further sublicense such Hyprotech Products
or MUSIC Products in Source Code Form; (b) a sublicense of its rights in the
Hyprotech Products or MUSIC Products in Source Code Form or Object Code Form
that authorizes or grants rights to such Third Party to incorporate or bundle
(in whole or in part) such Hyprotech Products or MUSIC Products in Source Code
Form or Object Code Form into a Third-Party Product for purposes of the
distribution or sale of such Third-Party Product; or (c) a sublicense of its
rights in the Hyprotech Products or MUSIC Products in Source Code Form that
authorizes or grants rights to such Third Party to use (in whole or in part)
such Hyprotech Products or MUSIC Products in Source Code Form in a Third-Party
Product for purposes of the distribution or sale of such Third Party Product;
PROVIDED FURTHER THAT AspenTech shall not have the right to grant to any Third
Party a sublicense of the Operator Training Products in Source Code Form, except
in connection with the performance of the Existing OTS Contracts.
Notwithstanding the limitations set forth in this Section 2.2, AspenTech shall
have the right to grant to any Major Product Line Acquirer a worldwide,
perpetual, irrevocable, sole and exclusive right and sublicense under all of the
applicable rights and licenses set forth in Sections 2.1(a) and/or 2.1(b) (with
the rights of such Major Product Line Acquirer to grant further sublicenses)
with respect to the Major Product Line IP for the Major Product Line acquired by
such Major Product Line Acquirer (each, a "MAJOR PRODUCT LINE SUBLICENSE"). For
avoidance of doubt, any sublicense by the Major Product Line Acquirer of the
Major Product Line IP to AspenTech or its Affiliates shall be subject to the
restrictions set forth herein on sublicensing to Third Parties as if AspenTech
and its Affiliates were Third Parties.

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     2.3   SUBLICENSES. Without limiting the terms and conditions of Section
2.2, AspenTech shall only grant sublicenses under the Licensed IP or Licensed
Property pursuant to written sublicense agreements ("SUBLICENSE AGREEMENTS").
Further:

           a.   In any Sublicense Agreement that includes a sublicense to the
Source Code Form of the software included in the Licensed Property, such
Sublicense Agreement shall (i) prohibit the sublicensee from making such
software in Source Code Form or any portion thereof available to third parties
pursuant to the GNU General Public License or any similar "open source code"
license or otherwise as freeware, shareware or on any other unrestricted basis,
and (ii) requires such sublicensee to maintain the confidentiality of such
software in Source Code Form and not to disclose such source code to any third
party, other than employees and consultants of such sublicensee that have
entered into written agreements that protect the confidentiality of such source
code; and

           b.   In any Sublicense Agreement that includes a sublicense to the
Object Code Form (but not the Source Code Form) of the software included in the
Licensed Property, such Sublicense Agreement shall prohibit the sublicensee from
reverse engineering, decompiling, or disassembling the Object Code Form of any
such sublicensed software; and

           c.   In any Sublicense Agreement that includes a sublicense to any
software included in the Licensed Property (whether in Source Code Form or
Object Code Form), such Sublicense Agreement shall (i) except in the case of a
Major Product Line Sublicense, require the return or destruction of all of such
sublicensed software after the termination of the applicable sublicense
agreement, and (ii) require such sublicensee to comply with terms that are not
inconsistent with the terms of this Agreement.

AspenTech shall, at its own expense, use commercially reasonable efforts to
investigate each instance of a material breach of any Sublicense Agreement that
AspenTech learns of and enforce the terms and conditions of each such Sublicense
Agreement. In the event any such sublicensee breaches a Sublicense Agreement and
such breach has an IP Material Adverse Effect, AspenTech shall promptly notify
Honeywell in writing and provide reasonably sufficient information for Honeywell
to assess the breach and AspenTech's resolution thereof.

     2.4   DELIVERY; RETENTION. Without limiting and subject to AspenTech's
delivery obligations under the Purchase Agreement, AspenTech shall be entitled
to retain copies of the Hyprotech Property, Operator Training Property, and
MUSIC Product in its possession immediately prior to the Effective Date,
PROVIDED THAT upon termination of the license set forth in Section 2.1(c), at
Honeywell's sole discretion and option, AspenTech shall (A) promptly deliver to
Honeywell all copies of the Operator Training Property that is in tangible form
including without limitation any materials embodying or containing the Operator
Training Property, or (B) destroy the Operator Training Property and furnish
Honeywell with a certificate signed by an executive officer of AspenTech
certifying as to its destruction.

     2.5   OWNERSHIP.

           a.   AspenTech acknowledges that Honeywell is the owner of all
rights, title and interest in and to the Licensed IP and Licensed Property
worldwide other than AspenTech's

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rights hereunder solely as a licensee. Nothing herein shall be construed to
establish or evidence ownership by AspenTech of any Licensed IP or Licensed
Property, in whole or in part. AspenTech shall not obtain or claim any ownership
or other interest in the Licensed Property or Licensed IP, or any portion
thereof, other than the non-exclusive licenses set forth herein. AspenTech shall
take no steps to challenge Honeywell's ownership of the Licensed Property and
the Licensed IP, or the validity or enforceability of the Licensed Property and
the Licensed IP.

           b.   AspenTech shall not obscure, alter, or remove any patent,
copyright, trademark, or service marking or legend contained on or in any
Licensed Property.

           c.   AspenTech shall promptly report to Honeywell any actual or
suspected violation of this Section 2.5 by an AspenTech Related Party that has
an IP Material Adverse Effect or by any other Third Party, and shall cooperate
with Honeywell and take such further steps as may reasonably be requested by
Honeywell, at Honeywell's expense, to prevent or remedy any such violation.

     2.6   NO WARRANTY. LICENSOR PROVIDES THE LICENSED PROPERTY AND LICENSED IP
ON AN "AS IS" BASIS WITHOUT WARRANTY OF ANY KIND. LICENSOR EXPRESSLY DISCLAIMS
ALL WARRANTIES AND CONDITIONS, EITHER EXPRESS OR IMPLIED, WITH RESPECT TO THE
LICENSED PROPERTY AND LICENSED IP, INCLUDING ALL IMPLIED WARRANTIES AND
CONDITIONS OF MERCHANTABILITY, NONINFRINGEMENT, TITLE AND FITNESS FOR A
PARTICULAR PURPOSE, OR ARISING OUT OF A COURSE OF DEALING, USAGE OR TRADE
PRACTICE. LICENSOR SPECIFICALLY DISCLAIMS ANY WARRANTY THAT THE FUNCTIONS
CONTAINED IN THE IT PROPERTY WILL MEET ASPENTECH'S REQUIREMENTS OR WILL OPERATE
IN COMBINATIONS OR IN A MANNER SELECTED FOR USE BY ASPENTECH, OR THAT THE
OPERATION OF ANY LICENSED PROPERTY WILL BE UNINTERRUPTED OR ERROR FREE.

3.   ENFORCEMENT

     3.1   HONEYWELL'S EXCLUSIVE RIGHT OF ENFORCEMENT. AspenTech shall notify
Honeywell of any actual or suspected infringement or unauthorized use of any
Licensed Property and Licensed IP by a AspenTech Related Party that has an IP
Material Adverse Effect or by any other Third Party within thirty (30) days
after becoming aware of such actual or suspected infringement or unauthorized
use. Honeywell shall continue to have at all times the sole and exclusive right,
but not the obligation, to take whatever lawful steps it deems necessary or
desirable to enforce the Licensed Property and Licensed IP against infringing
Third Parties, including the filing and prosecution of litigation, and AspenTech
shall reasonably cooperate in such action at Honeywell's expense. AspenTech
shall take no steps to enforce the Licensed Property and Licensed IP without
Honeywell's prior written consent.

4.   PAYMENTS

     4.1   NO PAYMENT. Neither Party shall have any obligation to make any
payment of any kind to the other Party under this Agreement or otherwise with
respect to the rights and licenses set forth hereunder.

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     4.2   TAXES. AspenTech agrees to bear and be responsible for the payment of
all taxes, levies, and assessments imposed on AspenTech and arising out of this
Agreement (excluding any tax based upon Honeywell's net income).

5.   ADDITIONAL COVENANTS

     5.1   CONFIDENTIALITY OF SOURCE CODE. Without limiting the rights and
licenses set forth in this Agreement, each Party agrees that, for a period of
fifteen (15) years from the Effective Date, it shall not disclose, or allow the
disclosure of, the Hyprotech Products, Operator Training Products, or MUSIC
Product in Source Code Form of any portion thereof to any person or entity
(including, without limitation, any employee, agent or contractor of such
Party), except (a) pursuant to a written confidentiality agreement that
prohibits the recipient from disclosing such source code to any third party
without the express written consent of the disclosing party and (b) if such
consent is given, each Party shall require in writing that any further
disclosure by the recipient is made only pursuant to a written confidentiality
agreement that is no less protective of the Hyprotech Products, Operator
Training Products, or MUSIC Products in Source Code Form than this Section 5.1,
PROVIDED THAT Honeywell's foregoing obligations with regard to the Operator
Training Products shall terminate upon the expiration of the OTS Term.

     5.2   OTHER CONFIDENTIAL LICENSED PROPERTY. Without limiting and in
addition to the rights and obligations under Section 5.1, AspenTech agrees that,
for a period of ten (10) years from the Effective Date, AspenTech shall not
disclose any Confidential Licensed Property to any person or entity (other than
employees of AspenTech), except (a) pursuant to a written confidentiality
agreement that prohibits the recipient from disclosing such confidential
information to any third party without the express written consent of AspenTech
and (b) if such consent is given, AspenTech shall require in writing that any
further disclosure by the recipient is made only pursuant to a written
confidentiality agreement that is no less protective of the confidential
information than this Section 5.2. The obligations of AspenTech specified in
this Section 5.2 shall not apply, and AspenTech shall have no further
obligations, with respect to any Confidential Licensed Property to the extent
that such Confidential Licensed Property is (i) generally known to the public at
the time of disclosure; (ii) becomes generally known without AspenTech or its
Affiliates violating any confidentiality obligations owed to Honeywell; or (iii)
is disclosed by Honeywell to a third party without any obligation of
confidentiality. Nothing in this Section 5.2 shall limit AspenTech's obligation
of confidentiality as set forth in Section 5.1.

     5.3   LIMITATION. Notwithstanding anything contained in Section 5.1 or 5.2
to the contrary, neither Section 5.1 nor 5.2 shall prohibit a Party from
disclosing any information subject thereto to the extent required in order for
such Party to comply with applicable laws and regulations or legal or
administrative processes or otherwise as required in order to protect or enforce
such Party's rights or to perform such Party's obligations under this Agreement,
the Ancillary Agreements or in connection with tax or other regulatory filings,
litigation or financial reporting purposes. In the event that either Party is
requested or required by a Governmental Entity (by oral questions,
interrogatories, requests for information or documents, subpoena, civil
investigative demand or similar process) to disclose any of the information
subject to Section 5.1 or 5.2, it is agreed that the Party will provide the
other Party with prompt notice of each such request so that the other Party may
seek an appropriate protective order or other appropriate remedy and the
notifying Party will reasonably cooperate with the other Party, at the other

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Party's expense, to obtain such protective order or other remedy. In the
event that such protective order or other remedy is not sought or obtained
within a reasonable time under the circumstances, the notifying Party may
furnish only that portion of the information which it is legally compelled to
disclose or advised by legal counsel to disclose and will use its commercially
reasonable efforts to obtain reliable assurance that confidential treatment will
be accorded any information so furnished.

     5.4   ADDITIONAL COVENANTS. Neither Party shall at any time make the
Licensed Property or Licensed IP or any portion thereof available to third
parties pursuant to the GNU General Public License or any similar "open source
code" license or otherwise as freeware, shareware or on any other unrestricted
basis.

     5.5   TECHNICAL ASSISTANCE. For purposes of clarity, neither Party is
obligated to provide any consulting or technical assistance to the other Party
except as otherwise expressly provided in the Software Support Agreement.

6.   LIABILITY

     6.1   EXCEPT FOR LIABILITIES WHICH ARE THE RESPONSIBILITY OF ASPENTECH
ARISING FROM A BREACH BY ASPENTECH OF SECTIONS 2.1, 2.2, 2.3, 2.5(a), 5.1, 5.2,
AND 5.3, IN NO EVENT SHALL EITHER PARTY BE LIABLE TO THE OTHER PARTY OR ANY
OTHER PERSON OR ENTITY FOR SPECIAL, INDIRECT, INCIDENTAL, PUNITIVE, EXEMPLARY,
STATUTORY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, LOSS OF
PROFITS, LOSS OF DATA OR LOSS OF USE DAMAGES) ARISING OUT OF THIS AGREEMENT OR
THE RIGHTS OR LICENSES SET FORTH HEREUNDER, EVEN IF SUCH PARTY HAS BEEN ADVISED
OF THE POSSIBILITY OF SUCH DAMAGES OR LOSSES.

7.   TERM

     7.1   TERM. The term of this Agreement shall begin as of the Effective Date
and shall remain in effect, with respect to each item of Licensed IP, for the
entire duration of such item of Licensed IP.

     7.2   SURVIVAL. The terms and conditions of the following Articles and
Sections will survive termination or expiration of this Agreement for any
reason: Sections 2.1, 2.2, 2.3, 2.5(a), 2.6, 5.1, 5.2, 5.3, 5.4, 6.1, this 7.2,
and Article 8. In addition, the termination or expiration of this Agreement
shall not relieve any party of any liability that accrued prior to such
termination or expiration or any losses from any willful breach. Except as
expressly provided in this Section 7.2, all other provisions of this Agreement
shall terminate upon the expiration or termination hereof.

8.   MISCELLANEOUS

     8.1   NO THIRD PARTY BENEFICIARIES. This Agreement shall not confer any
rights or remedies upon any person other than the Parties and their respective
permitted successors and permitted assigns.

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     8.2   ACTION TO BE TAKEN BY AFFILIATES; PARENT GUARANTEE. AspenTech shall
ensure and guarantee that each Affiliate to whom AspenTech sublicenses rights in
the Licensed Property or Licensed IP after the date hereof uses it in a manner
that is consistent with the terms of this Agreement. Any failure of any such
Affiliate to comply with the provisions of this Agreement relating to the
Licensed Property or the Licensed IP shall be deemed to constitute a breach of
this Agreement by AspenTech. Aspen Technology, Inc. ("PARENT") hereby guarantees
the obligations of AspenTech and its Affiliates under this Agreement that may
arise as a result of any breach of this Agreement by AspenTech or its
Affiliates.

     8.3   ENTIRE AGREEMENT. This Agreement (together with the Purchase
Agreement, all documents referred to therein, the Ancillary Agreements and the
Confidentiality Agreement) constitutes the entire agreement between AspenTech
and Honeywell. These Agreements supersede any prior agreements or understandings
between AspenTech and Honeywell (including, without limitation, the Letter of
Intent dated May 13, 2004 by and between Parent and Honeywell), whether written
or oral, with respect to the subject matter covered by such agreements, other
than the Confidentiality Agreement.

     8.4   SUCCESSION AND ASSIGNMENT. The licenses set forth in this Agreement
are personal to AspenTech and, except as expressly provided herein, AspenTech
may not assign or sublicense this Agreement, or any of its rights herein, or
delegate any of its obligations hereunder, without the prior written approval of
Honeywell. Notwithstanding the foregoing, AspenTech may assign all, but not less
than all, of its rights under this Agreement to (a) any Affiliate of AspenTech,
PROVIDED THAT such assignment will not relieve AspenTech of any obligation or
duty hereunder if not performed by such Affiliate and AspenTech and Parent shall
guarantee the performance by such Affiliate, and (b) a successor to all or
substantially all of that portion of its business to which this Agreement
relates, in each case, without the prior consent of Honeywell. Any permitted
assignee shall be bound to the provisions of this Agreement. Honeywell may
assign this Agreement and any of its rights herein, or delegate any of its
obligations hereunder, without the prior written approval of AspenTech, provided
that any such assignee assumes all of Honeywell's rights and obligations
hereunder. Any attempted assignment in violation of this provision shall be void
ab initio and of no force and effect. This Agreement shall be binding upon and
inure to the benefit of the Parties and their respective permitted successors
and permitted assigns.

     8.5   NOTICES. All notices, requests, demands, claims, and other
communications hereunder shall be in writing. Any notice, request, demand, claim
or other communication hereunder shall be deemed duly delivered four business
days after it is sent by registered or certified mail, return receipt requested,
postage prepaid, or one business day after it is sent for next business day
delivery via a reputable nationwide overnight courier service, in each case to
the intended recipient as set forth below:

                                       10
<Page>

     IF TO HONEYWELL:                  COPY TO:


     Telecopy:                         Telecopy:
     Attention:                        Attention:

     IF TO ASPENTECH:                  COPY TO:

     Aspen Technology, Inc.            Wilmer Cutler Pickering Hale and Dorr LLP
     Ten Canal Park                    60 State Street
     Cambridge, MA 02141               Boston, MA  02109
     Telecopy:  (617) 949-1717         Telecopy:  (617) 526-5000
     Attention:  General Counsel       Attention:  Mark L. Johnson, Esq.

Any Party may give any notice, request, demand, claim or other communication
hereunder using any other means (including personal delivery, expedited courier,
messenger service, telecopy, telex, ordinary mail or electronic mail), but no
such notice, request, demand, claim or other communication shall be deemed to
have been duly given unless and until it actually is received by the Party for
whom it is intended. Any Party may change the address to which notices,
requests, demands, claims and other communications hereunder are to be delivered
by giving the other Party notice in the manner herein set forth.

     8.6   AMENDMENTS AND WAIVERS. The Parties may mutually amend or waive any
provision of this Agreement at any time. No amendment or waiver of any provision
of this Agreement shall be valid unless the same shall be in writing and signed
by all of the Parties. No waiver by any Party of any default, misrepresentation
or breach of warranty or covenant hereunder, whether intentional or not, shall
be deemed to extend to any prior or subsequent default, misrepresentation or
breach of warranty or covenant hereunder or affect in any way any rights arising
by virtue of any prior or subsequent such occurrence.

     8.7   SEVERABILITY. Any term or provision of this Agreement that is invalid
or unenforceable in any situation in any jurisdiction shall not affect the
validity or enforceability of the remaining terms and provisions hereof or the
validity or enforceability of the offending term or provision in any other
situation or in any other jurisdiction. If the final judgment of a court of
competent jurisdiction declares that any term or provision hereof is invalid or
unenforceable, the Parties agree that the body making the determination of
invalidity or unenforceability shall have the power to reduce the scope,
duration or area of the term or provision, to delete specific words or phrases,
or to replace any invalid or unenforceable term or provision with a term or
provision that is valid and enforceable and that comes closest to expressing the
intention of the invalid or unenforceable term or provision, and this Agreement
shall be enforceable as so modified.

     8.8   EXPENSES. Except as otherwise specifically provided to the contrary
in this Agreement, each of the Parties shall bear its own costs and expenses
(including legal fees and expenses) incurred in connection with this Agreement
and the transactions contemplated hereby

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<Page>

including, without limitation, any brokerage fees, commissions or finders fees
in connection with the transactions contemplated by this Agreement.

     8.9   SPECIFIC PERFORMANCE. (a) AspenTech acknowledges and agrees that
Honeywell would be damaged irreparably in the event any of the provisions of
Sections 2.1, 2.2, 2.3, 2.5(a), 2.5(c), 3, 5.1, 5.2, 5.3, and/or 5.4 of this
Agreement are not performed in accordance with their specific terms or otherwise
are breached. Accordingly, AspenTech agrees that Honeywell may be entitled to an
injunction or injunctions to prevent breaches of, and enforce, Sections 2.1,
2.2, 2.3, 2.5(a), 2.5(c), 3, 5.1, 5.2, 5.3, and 5.4 of this Agreement in any
action instituted in or before any Governmental Entity. (b) Honeywell
acknowledges and agrees that AspenTech would be damaged irreparably in the event
any of the provisions of Sections 5.1 and/or 5.4 of this Agreement are not
performed in accordance with their specific terms or otherwise are breached.
Accordingly, Honeywell agrees that AspenTech may be entitled to an injunction or
injunctions to prevent breaches of, and enforce, Sections 5.1 and 5.4 of this
Agreement in any action instituted in or before any Governmental Entity.

     8.10  NO LIMITATION OF REMEDIES. Except as expressly set forth in this
Agreement, nothing in this Agreement shall be construed as limiting any relief
or remedies which Honeywell has at law or in equity for breach of this
Agreement.

     8.11  GOVERNING LAW. This Agreement and any disputes hereunder shall be
governed by and construed in accordance with the internal laws of the State of
New York without giving effect to any choice or conflict of law provision or
rule (whether of the State of New York or any other jurisdiction) that would
cause the application of laws of any jurisdiction other than those of the State
of New York.

     8.12  SUBMISSION TO JURISDICTION. Each Party (a) submits to the exclusive
jurisdiction of any state or federal court sitting in the State of New York in
any action or proceeding arising out of or relating to this Agreement, (b)
agrees that all claims in respect of such action or proceeding may be heard and
determined only in any such court, (c) waives any claim of inconvenient forum or
other challenge to venue in such court, and (d) agrees not to bring any action
or proceeding arising out of or relating to this Agreement in any other court.
Each Party agrees to accept service of any summons, complaint, or other initial
pleading made in the manner provided for the giving of notices in Section 8.5.
Nothing in this Section 8.11 however, shall affect the right of any Party to
serve such summons, complaint, or initial pleading in any other manner permitted
by law.

     8.13  CONSTRUCTION.

           a.   The language used in this Agreement shall be deemed to be the
language chosen by the Parties to express their mutual intent, and no rule of
strict construction shall be applied against any Party.

           b.   Any reference to any federal, state, local or foreign statute or
law shall be deemed also to refer to all rules and regulations promulgated
thereunder, unless the context requires otherwise.

                                       12
<Page>

           c.   The section headings contained in this Agreement are inserted
for convenience only and shall not affect in any way the meaning or
interpretation of this Agreement.

           d.   Any reference herein to an Article, section, or clause shall be
deemed to refer to an Article, section, or clause of this Agreement, unless the
context clearly indicates otherwise.

           e.   All references to "$", "Dollars" or "US$" refer to currency of
the United States of America.

     8.14  WAIVER OF JURY TRIAL. To the extent permitted by applicable law, each
Party hereby irrevocably waives all rights to trial by jury in any action,
proceeding or counterclaim (whether based on contract, tort or otherwise)
arising out of or relating to this Agreement or the transactions contemplated
hereby or the actions of any Party in the negotiation, administration,
performance and enforcement of this Agreement.

     8.15  INCORPORATION OF EXHIBITS. The Exhibits identified in this Agreement
are incorporated herein by reference and made a part hereof.

     8.16  COUNTERPARTS AND FACSIMILE SIGNATURE. This Agreement may be executed
in one or more counterparts, each of which shall be deemed an original but all
of which together shall constitute one and the same instrument. This Agreement
may be executed by facsimile signature.

     8.16  EXPORT. AspenTech shall comply with all applicable export laws and
regulations of all jurisdictions with respect to the Licensed Property and
obtain, at its own expense, any required permits or export clearances.

                                       13
<Page>

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

          HONEYWELL CONTROL SYSTEMS LIMITED:


                         By:      /s/John R. Ethier
                            ----------------------------------
                         Name:       John R. Ethier
                              -------------------------------
                         Title:       V.P. CFO
                               -------------------------------


          HYPROTECH UK LTD.

                         By:      /s/Stephen J. Doyle
                            -----------------------------------
                         Name:       Stephen J. Doyle
                              ---------------------------------
                         Title:       Director
                               ---------------------------------


Solely with respect to Sections 8.2 and 8.4 hereof:

          ASPEN TECHNOLOGY, INC.

                         By:    /s/Charles F. Kane
                            ---------------------------------------
                         Name:   Charles F. Kane
                               ------------------------------------
                         Title:      Interim CEO and CFO
                               ------------------------------------


                      [SIGNATURE PAGE TO LICENSE AGREEMENT]

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