Document:

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                                                                    Exhibit 10.5
                                    WAIVER
                                    ------

     This Waiver, made as of May 18, 2000 (this "Waiver"), is by and among NMT
Medical, Inc. (the "Company"), on the one hand, and Whitney Subordinated Debt
Fund, L.P. (the "Purchaser"), on the other hand. Capitalized terms used herein
and not otherwise defined have the meanings assigned to such terms in the
Purchase Agreement (as defined below).

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

     WHEREAS, the Company and the Purchaser are parties to the Subordinated Note
and Common Stock Purchase Agreement, dated as of July 8, 1998, as amended by (i)
Amendment No. 1, dated April 14, 1999, (ii) Amendment No. 2, dated September 13,
1999, and (iii) Amendment No. 3, dated as of April 5, 2000, by and among the
Company, the Purchaser, and, for certain purposes, J. H. Whitney & Co. (as so
amended, the "Purchase Agreement"), regarding the Company's $20,000,000
subordinated notes due September 30, 2003;

     WHEREAS, the Company has requested the Purchaser to waive compliance with
certain covenants contained in the Purchase Agreement for the fiscal quarter
ended March 31, 2000.

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

1.    The Purchaser hereby waives compliance by the Company with the provisions
of Sections 9.8(a), (b) and (d) of the Purchase Agreement solely with respect to
the fiscal quarter ended March 31, 2000.

2.    This Waiver may be signed in counterparts, and by the various parties on
separate counterparts.  Each set of counterparts which contains the signature of
each of the parties shall constitute a single instrument with the same effect as
if the signature thereto were upon the same instrument.  The parties hereto
agree that each party shall accept facsimile signatures as legally sufficient,
binding and admissible evidence of the execution of this Waiver.

3.    Except as expressly modified by this Waiver, all of the terms and
provisions of the Purchase Agreement, by and among the Company and the
Purchaser, and the Notes shall continue in full force and effect and all parties
hereto shall be entitled to the benefits thereof.

4.    This Waiver shall be governed by and construed in accordance with the laws
of the State of New York, without regard to the principles of conflict of laws
of such state.

5.    IN WITNESS WHEREAS, the parties hereto have caused this Waiver to be
signed by their respective duly authorized officers as of the date first written
above.
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                              NMT MEDICAL, INC.

                              By: /s/ William J. Knight
                                 ----------------------
                                  Name: William J. Knight
                                  Title: Vice President-Finance and
                                         Administration and Chief Financial
                                         Officer

                              WHITNEY SUBORDINATED DEBT FUND, L.P.

                              By: /s/ James A. Fordyce
                                 --------------------------
                                 Name: James A. Fordyce
                                 A General Partner

                                       2<PAGE>
                                                                    EXHIBIT 10.1

                             CONSULTING AGREEMENT

    AGREEMENT effective as of March 1, 2000, by and between FOCUS
Enhancements, Inc., a Delaware corporation, having as its principal business
address 600 Research Drive, Wilmington, Massachusetts 01887 (hereinafter
referred to as the "Company") and William Coldrick, having a residence at 255
Seapine Road, North Chatham, MA 02650 (hereinafter referred to as "Consultant").

RECITALS:

     WHEREAS, Consultant has certain skills and abilities that may be useful to
the Company.

     WHEREAS, Consultant is an independent contractor willing to provide
services to the Company for the period contemplated by this Agreement.

TERMS AND CONDITIONS:

     NOW, THEREFORE, in consideration of the mutual promises and covenants
herein contained, and other good and valuable consideration, receipt and
adequacy whereof is hereby acknowledged, the parties hereto hereby agree as
follows:

     1. Retention of Consultant. The Company hereby retains Consultant solely as
        -----------------------
an independent contractor and not as an employee, and Consultant hereby accepts
such retention upon the terms and conditions hereinafter set forth.

     2. Term.  Subject to the provisions for termination as hereinafter
        ----
provided, the term of this Agreement shall begin as set forth above and shall
terminate no later than one year from such date unless extended by Company and
Consultant. All work performed under such an extension shall remain subject to
these terms and conditions.

     3. Compensation. For all services rendered by Consultant under this
        ------------
Agreement, the Company shall pay Consultant one thousand ($1000) per day. Travel
costs, if any, must be pre-approved by an officer of Company must be documented
by receipts showing all expenses over $25.00. All air travel shall be made by
coach or economy class and any hotels must be pre-approved by Company.

     4. Duties. The Consultant is being retained to provide consultants to
        ------
Company as set forth in various Work Orders. It is required that Consultant be
available to perform its duties under this Agreement at such times as the
Company requires from time to time.

     5. Extent of Services: Confidentiality. Consultant shall devote such time,
        -----------------------------------
attention and energies to its duties hereunder as are required. In connection
with the performance of consulting services for Company, it is understood that
the Company may disclose to Consultant, or Consultant may have access to
Company's "Confidential Information" (as hereinafter defined). As used herein,
the term "Confidential Information" shall mean any and all proprietary or
confidential information, whether or not developed by Consultant, including,
without limitation: (i) any and all software programs, derivative works,
products and other results of the services performed by Consultant on a Company
project (together the "Work Product"); (ii) any and all technical information of
Company, including, without limitation, product data and specifications, know-
how, formulae, the source code, and other software information, processes,
inventions, research projects, and product development; (iii) any and all
business information of or relating to Company that is not known to the general
public, including, without limitation, accounting and financial information,
sales and marketing information, research, investment analyses, investment
strategies and techniques, investment transactions and holdings, clients,
personnel, shareholders, and information concerning funds and clients advised by
Company, "know-how" and information, data and material used or licensed by the
Company, including, but not limited to computer software, programming, research,
financial information and analyses, and the like and documentation relating
thereto; (iv) any and all employee information of Company; and (v) confidential
information disclosed to Company by third parties. Consultant acknowledges and
agrees that the Confidential Information constitutes valuable trade secrets of
Company. Company and Consultant agree that a separate confidentiality agreement
has been executed between the parties and that to the extent there is a conflict
between the provisions of this Agreement and the confidentiality agreement, the
terms of the confidentiality agreement shall apply.
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     Consultant shall not disclose any Confidential Information to any third
party, nor shall Consultant use any Confidential Information for any purpose
other than the performance of Consultant's services for the Company. All
materials furnished to Consultant by the Company shall be considered
Confidential Information, shall remain the property of the Company and shall be
returned to the Company promptly upon the termination of this Agreement or at
the Company's earlier request. Consultant shall not copy, reproduce or
appropriate for its benefit or the benefit of any third party, any of the
Confidential Information.

     Consultant's obligations under this section will continue for each item of
Confidential Information until such time as Consultant can show that such item
of Confidential Information (i) is or becomes publicly available other than as a
result of any act or failure to act by Consultant; (ii) was known to Consultant,
without an obligation to keep it confidential, prior to Consultant's receipt of
such item of Confidential Information from Company; or (iii) has legally and
properly been received by Consultant from a person other than Company, through
no breach of any agreement with Consultant or Company and without an obligation
to keep it confidential.  Consultant acknowledges that the Company or any other
owner of any Confidential Information may suffer irreparable harm if Consultant
were to violate any of the foregoing undertakings and therefore agrees that, in
addition to any other remedies such party may have, it shall be entitled
(without the requirement of posting any bond) to seek from a court of competent
jurisdiction an injunction restraining the violation of any such undertaking (or
any participation therein).

     6. Ownership of Work Product. All items, programs, ideas and the like and
        -------------------------
all work product, including source code, table structures, forms, reports and
programming tools created by or with the assistance of Consultant pursuant to
this Agreement, whether prepared on or off Company premises, shall be and remain
the property of the Company alone, and shall be deemed to be works made for
hire. To the extent that any items may not, by operation of law, be works made
for hire, Consultant hereby assigns to Company the ownership of all rights,
titles and interests in such items, including but not limited to copyrights, and
the Company shall have the right to obtain and hold in its own name copyright or
other protection which may be available or become available in the items.
Consultant agrees to give Company, its designees, or assignees all assistance
reasonably required to perfect such rights, titles and interests. Consultant
agrees to disclose promptly to Company all inventions, discoveries, formulas,
processes, designs, trade secrets and other useful information and know-how
made, discovered or developed by Consultant alone or in conjunction with any
other person or entity during the term of this Agreement that are based on,
derived from or make use of any Confidential Information or any other
information disclosed to or acquired by Consultant during the term of the
Agreement and all such information shall be deemed Confidential Information.

     7.  Termination. Either Company or Consultant may cancel this Agreement
         -----------
upon 30 days prior written notice to the other; however, no additional billable
work will be performed by Consultant once it has been informed by Company that
it wishes to terminate this Agreement. Company may terminate any particular Work
Order at any time upon written notice. Upon receipt of any termination notice,
consultant shall immediately discontinue services to the extent specified in the
notice. In addition upon termination, all unbilled time will be immediately
invoiced and presented for payment. At such time as Company has made such final
payment, Company will have no further obligation or liability to Consultant,
under this Agreement. Consultant agrees that Company may in its sole discretion,
require Consultant to replace any of its personnel performing work for Company.

     8.  Insurance. Consultant covenants and agrees that it has, in full force
         ---------
and effect, Workers' Compensation, Public Liability and Property Damage
insurance, and that Consultant further indemnifies Company against loss
resulting from injury to Consultant during the course of performance of service
work under this Agreement. Consultant further assumes full responsibility for
any acts of damage or destruction, including personal injury, caused by the
Consultant during the course of such work. Consultant is not responsible for and
shall not indemnify Company for injury or damage caused by negligence of
Company.

     9.  Notices. All notices under this Agreement shall be made in writing and
         -------
shall be deemed properly delivered when (i) delivered personally, or (ii) by the
mailing of such notice to the parties entitled thereto, registered or certified
mail, postage prepaid to the parties at the addresses set forth above, and in
the case of Company, to the attention of Gary Cebula, Chief Financial Officer
and Treasurer, with a copy to Christopher P. Ricci, General Counsel and Senior
Vice President.

     10. Nonassignability. Consultant shall not subcontract or assign the
         ----------------
Agreement, or otherwise dispose of its right, title, or interest therein or any
part thereof to any third party, without obtaining the prior written consent of
the Company. Consent by the Company to any assignment or subcontract of any Work
Order or the Agreement shall not be deemed to create a contractual relationship
between the Company and the subcontracting party or assignee.

<PAGE>

     11. Compliance with Law and Company Policies; Personal Securities
         -------------------------------------------------------------
Transactions. Consultant shall perform its duties hereunder in accordance with
------------
all applicable federal, state and local laws, rules, regulations and codes.
Consultant shall comply with all Company standards, rules, procedures and
policies relating to or affecting the conduct of Consultant's personnel.

     Without limiting the foregoing, Consultant will comply with Company's rules
and policies with respect to security of and access to Company's premises and
telephone and electronic mail facilities. Any software Consultant wishes to load
onto Company's computers or computer system must be approved in writing by
Company prior to Consultant loading such software. Company agrees to inform
Consultant of and Consultant agrees to follow all Company standards and policies
related to the Company computer systems (e.g., security, environmental, disaster
recovery, virus detection and removal). Consultant shall use Company software,
hardware and data solely for the purposes contemplated hereby.

     Without limiting the foregoing, Consultant will comply with Company's Code
of Ethics which restricts personal securities transactions executed, directly or
indirectly, by or on behalf of any person (including Consultant and Consultant's
directors, officers, employees, agents, consultants and representatives) with
access to Company's Confidential Information. In the event Consultant desires to
engage in any personal securities transaction within the scope of Company's Code
of Ethics during the term of this Agreement, it shall first contact Company's
General Counsel in order to ensure that Consultant is in full compliance with
Company's Code of Ethics.

     Consultant shall indemnify Company for any loss or damage that may be
sustained by Company by reason of Consultant's failure to comply with this
Section 12.

     12. Subcontracting, Responsibility for Employees and Agents. The hiring or
         -------------------------------------------------------
use of outside services, subcontractors or consultants by Consultant in
connection with this Agreement shall not be permitted without the prior written
approval of Company. Consultant shall be fully responsible for all acts or
omissions of its employees, officers, directors, agents, consultants and
representatives, including without limitation their compliance with the terms of
this Agreement.

     13. Consultant's Employees. Consultant represents, warrants and covenants
         ----------------------
that all personnel used by Consultant in performing its duties hereunder shall
be employees of Consultant. In no event shall such personnel be deemed in any
way to be employees of Company. Consultant acknowledges and agrees that this
consulting arrangement shall not give or extend to Consultant any rights with
respect to contributions by the Company to any deferred compensation plan, bonus
plans, or fringe benefits (including, but in no way limited to holiday pay,
medical or life insurance benefits, sick pay or paid vacation), and further
agrees to hold the Company harmless from any employment, income or other taxes
or any other damages which may be assessed in connection with payments to
Consultant or which may be suffered by Company due to any breach of the
foregoing warranties.

     14. Miscellaneous. This Agreement and the Confidentiality Agreement contain
         -------------
the entire agreement between the parties hereto and supersedes all prior and
contemporaneous agreements, arrangements, negotiations and understandings
between the parties hereto, relating to the subject matter hereof. There are no
other understandings, statements, promises or inducements, oral or otherwise,
contrary to the terms of these agreements. No waiver of any term, provision, or
condition of this Agreement, whether by conduct or otherwise, in any one or more
instances, shall be deemed to be, or shall constitute, a waiver of any other
provision hereof, whether or not similar, nor shall such waiver constitute a
continuing waiver, and no waiver shall be binding unless executed in writing by
the party making the waiver. Consultant's obligations in Sections 5, 6 and 7
shall survive termination of this Agreement.

     No supplement, modification or amendment of any term, provision or
condition of these agreements shall be binding or enforceable unless executed in
writing by the parties hereto. The subject headings of the articles, paragraphs
and subparagraphs of this Agreement are included solely for purposes of
convenience and reference only, and shall not be deemed to explain, modify,
limit, amplify or aid in the meaning, construction or interpretation of any of
the provisions of this Agreement. Should any part, term or provision of this
Agreement or any document required herein to be executed be declared invalid,
void or unenforceable, all remaining parts, terms and provisions hereof shall
remain in full force and effect and shall in no way be invalidated, impaired or
affected thereby. These agreements shall be governed by and construed and
enforced in accordance with and subject to the internal laws of the Commonwealth
of Massachusetts. Each party hereby submits to the exclusive jurisdiction of the
appropriate state or federal courts in Massachusetts.
<PAGE>

     IN WITNESS WHEREOF, the undersigned have executed this Agreement by duly
authorized officers thereof as of the date first above written.

FOCUS Enhancements, Inc.            Consultant

By: /s/ Christopher P. Ricci          By: /s/ William B. Coldrick
   ---------------------------           ------------------------------

Print: Christopher P. Ricci           Print: William B. Coldrick
       -----------------------              ---------------------------

Title: Sr. Vice President             Title:
       -----------------------              ---------------------------

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