<PAGE>
 
                                                                   EXHIBIT 10.34

                                           As Amended Through September 18, 1996
                                           -------------------------------------


                               MARCAM CORPORATION

                  1991 NON-EMPLOYEE DIRECTOR STOCK OPTION PLAN


     1.  Purpose.  This Non-Qualified Stock Option Plan to be known as the 1991
         -------                                                               
Non-Employee Director Stock Option Plan (hereinafter, this "Plan") is intended
to promote the interests of Marcam Corporation (hereinafter, the "Company") by
providing an inducement to obtain and retain the services of qualified persons
who are neither employees nor officers of the Company to serve as members of its
Board of Directors (the "Board").

     2.  Available Shares.  The total number of shares of Common Stock, par
         ----------------                                                  
value $.01 per share, of the Company (the "Common Stock"), for which options may
be granted under this Plan shall not exceed two hundred ten thousand (210,000)
shares, subject to adjustment in accordance with paragraph 10 of this Plan.
Shares subject to this Plan are authorized but unissued shares or shares that
were once issued and subsequently reacquired by the Company.  If any options
granted under this Plan are surrendered before exercise or lapse without
exercise, in whole or in part, the shares reserved therefor shall continue to be
available under this Plan.

     3.  Administration.  This Plan shall be administered by the Board or by a
         --------------                                                       
committee appointed by the Board (the "Committee").  In the event the Board
fails to appoint or refrains from appointing a Committee, the Board shall have
all power and authority to administer this Plan.  In such event, the word
"Committee" wherever used herein shall be deemed to mean the Board.  The
Committee shall, subject to the provisions of the Plan, have the power to
construe this Plan, to determine all questions hereunder, and to adopt and amend
such rules and regulations for the administration of this Plan as it may deem
desirable.  No member of the Board or the Committee shall be liable for any
action or determination made in good faith with respect to this Plan or any
option granted under it.

     4.  Automatic Grant of Options.  Subject to the availability of shares
         --------------------------                                        
under this Plan, (a) as of the date that a person either (i) is first elected to
the board and is neither an employee nor an officer of the Company at such time,
or (ii) while continuing to serve on the board, ceases to serve as an employee
or officer of the Company, such person shall be automatically granted on such
date, without further action by the Board, an option to purchase twenty thousand
(20,000) shares of the Common Stock; provided, however, that no such option
                                     --------  -------                     
shall be granted if prohibited pursuant to the terms of any agreement, whether
existing at the time of grant or thereafter, between the Company and any member
of the Board of Directors or any affiliate of such member; and (b) each person
who is a member of the Board on January 1 of each year, commencing with January
1, 1996, and who is neither an employee nor officer of the Company on such date
shall be automatically granted on each such date, without further action of the
Board, an option to purchase three thousand (3,000) shares of the Common Stock;
provided, however, that no such option shall be granted if prohibited pursuant
--------  -------                                                             
to the terms of any agreement, whether 
<PAGE>
 
                                      -2-


existing at the time of grant or thereafter, between the Company and any member
of the Board of Directors or any affiliate of such member. The options to be
granted under this paragraph 4 shall be the only options ever to be granted at
any time to such member under this Plan. Anything in this Plan to the contrary
notwithstanding, the effectiveness of this Plan and of the grant of all options
hereunder is in all respects subject to, and this Plan and options granted under
it shall be of no force and effect unless and until, the approval of this Plan
by the affirmative vote of the holders of a majority of the shares of the Common
Stock present in person or by proxy and entitled to vote at a meeting of
stockholders at which this Plan is presented for approval. In the event that
such approval as aforesaid has not been received on or before April 30, 1992,
this Plan and any options granted hereunder shall be null and void, and upon the
occurrence of such approval as aforesaid, this Plan and such options shall
become effective as of the date of grant thereof.

     Except for the specific options referred to above, no other options shall
be granted under this Plan.

     5.  Option Price.  The purchase price of the stock covered by an option
         ------------                                                       
granted pursuant to this Plan shall be 100% of the fair market value of such
shares on the day the option is granted.  The option price will be subject to
adjustment in accordance with the provisions of paragraph 10 of this Plan.  For
purposes of this Plan, if, at the time an option is granted under the Plan, the
Company's Common Stock is publicly traded, "fair market value" shall be
determined as of the last business day for which the prices or quotes discussed
in this sentence are available prior to the date such option is granted and
shall mean (i) the average (on that date) of the high and low prices of the
Common Stock on the principal national securities exchange on which the Common
Stock is traded, if the Common Stock is then traded on a national securities
exchange; or (ii) the last reported sale price (on that date) of the Common
Stock on the NASDAQ National Market List, if the Common Stock is not then traded
on a national securities exchange; or (iii) the closing bid price (or average of
bid prices) last quoted (on that date) by an established quotation service for
over-the-counter securities, if the Common Stock is not reported on the NASDAQ
National Market List.

     6.  Period of Option.  Unless sooner terminated in accordance with the
         ----------------                                                  
provisions of paragraph 8 of this Plan, an option granted hereunder shall expire
on the date which is ten (10) years after the date of grant of the option.

     7.  Vesting of Shares and Non-Transferability of Options.
         -----------------------------------------------------

         (a) Vesting. Options granted under this Plan shall not become 
             -------     
exercisable until they become vested. Options granted under clause (a) of the
first sentence of paragraph 4 of this Plan shall vest in the optionee and thus
become exercisable, in accordance with the following schedule provided that the
optionee has continuously served as a member of the Board through such vesting
date:
<PAGE>
 
                                      -3-

<TABLE>
<CAPTION>
 
             Cumulative Number
            of Shares for which
         Option Will be Exercisable   Date of Vesting
         --------------------------   ---------------
        <S>                           <C>
 
               4,000  shares          One year after date of grant
               8,000  shares          Two years after date of grant
               12,000 shares          Three years after date of grant
               16,000 shares          Four years after date of grant
               20,000 shares          Five years after date of grant
</TABLE>

     Options granted under clause (b) of the first sentence of paragraph 4 of
this Plan shall vest in the optionee and thus become exercisable, in accordance
with the following schedule provided that the optionee has continuously served
as a member of the Board through such vesting date:

<TABLE>
<CAPTION>
 
             Cumulative Number
            of Shares for which
         Option Will be Exercisable  Date of Vesting
         --------------------------  ---------------
        <S>                           <C>
 
               750   shares           One year after date of grant
               1,500 shares           Two years after date of grant
               2,250 shares           Three years after date of grant
               3,000 shares           Four years after date of grant
 
</TABLE>

     The number of shares as to which options may be exercised shall be
cumulative, so that once the option shall become exercisable as to any shares it
shall continue to be exercisable as to said shares, until expiration or
termination of the option as provided in this Plan.

             (b) In the event of a Change in Control (as hereinafter defined) of
   the Company, the date on which all outstanding options and all installments
   of such options may be exercised shall be accelerated to immediately prior to
   the time of the Change in Control.

             (c) For purposes of this Plan and any options granted hereunder, a
   "Change in Control" shall have occurred if at any time any of the following
   events shall occur:

                 (i)  The Company is merged, consolidated or reorganized into or
       with another corporation or other legal person, and as a result of such
       merger, consolidation or reorganization less than a majority of the
       combined voting 
<PAGE>
 
                                      -4-

       power of the then-outstanding securities of the combined corporation or
       person immediately after such transaction are held in the aggregate by
       the holders of the combined voting power of the then-outstanding
       securities entitled to vote generally in the election of directors of the
       Company ("Voting Stock") immediately prior to such transaction;

               (ii)   The Company sells or otherwise transfers all or
       substantially all of its assets to any other corporation or other legal
       person, and less than a majority of the combined voting power of the
       then-outstanding securities of such corporation or person immediately
       after such sale or transfer is held in the aggregate by the holders of
       the Voting Stock of the Company immediately prior to such sale or
       transfer;

               (iii)  There is a report filed on Schedule 13D or Schedule 14D-1
       (or any successor schedule, form or report), each as promulgated pursuant
       to the 1934 Act, disclosing that any person (as the term "person" is used
       in Section 13(d)(3) or Section 14(d)(2) or the 1934 Act) has become the
       beneficial owner (as the term "beneficial owner" is defined under Rule
       13d-3 or any successor rule or regulation promulgated under the 1934 Act)
       of securities representing 25% or more of the Voting Stock;

               (iv)   The Company files a report or proxy statement with the
       Securities and Exchange Commission pursuant to the 1934 Act disclosing in
       response to Form 8-K or Schedule 14A (or any successor schedule, form or
       report or item therein) that a change in control of the Company has or
       may have occurred or will or may occur in the future pursuant to any
       then-existing contract or transaction; or

               (v)    If during any period of two consecutive years, individuals
       who at the beginning of any such period constitute the directors of the
       Company cease for any reason to constitute at least a majority thereof,
       unless the election, or the nomination for election by the Company's
       stockholders, of each director of the Company first elected during such
       period was approved by a vote of at least two-thirds of the directors
       then still in office who were directors of the Company at the beginning
       of any such period;

   provided, however, that notwithstanding the foregoing provisions of this
   -----------------                                                       
   subparagraph (c), a "Change in Control" shall not be deemed to have occurred
   for purposes of this Plan solely because (i) the Company, (ii) an entity in
   which the Company directly or indirectly beneficially owns 50% or more of the
   voting securities, (iii) any Company-sponsored employee stock ownership plan
   or any other employee benefit plan of the Company, or (iv) any corporation or
   legal person approved by the Board prior to the occurrence of the event that,
   absent such approval by the Board, would have constituted a Change in
   Control, either files or becomes obligated to file a report or a proxy
   statement under or in response to Schedule 13D, Schedule 14D-1, Form 8-K or
   Schedule 14A (or any successor schedule, form or report or item therein)
   under the 1934 Act, disclosing beneficial ownership by it of shares of Voting
   Stock, whether in excess of 25% or otherwise, or because the Company reports
   that a change in control of the Company has or may have occurred or will or
   may occur in the future by reason of such beneficial ownership.
<PAGE>
 
                                      -5-

          (d) Legend on Certificates.  The certificates representing such shares
              ----------------------                                            
shall carry such appropriate legend, and such written instructions shall be
given to the Company's transfer agent, as may be deemed necessary or advisable
by counsel to the Company in order to comply with the requirements of the
Securities Act of 1933 or any state securities laws.

          (e) Non-transferability.  Any option granted pursuant to this Plan
              -------------------                                           
shall not be assignable or transferable other than by will or the laws of
descent and distribution or pursuant to a qualified domestic relations order
defined by the Internal Revenue Code of 1986, as amended, or Title I of the
Employee Retirement Income Security Act of 1974, or the rules thereunder, and
shall be exercisable during the optionee's lifetime only by him or her.

     8.   Termination of Option Rights.
          ---------------------------- 

          (a) In the event an optionee ceases to be a member of the Board for
any reason other than death, permanent disability or retirement, any then
unexercised portion of options granted to such optionee shall, to the extent not
then vested, immediately terminate and become void; any portion of an option
which is then vested but has not been exercised at the time the optionee so
ceases to be a member of the Board may be exercised, to the extent it is then
vested, by the optionee within 90 days of the date the optionee ceased to be a
member of the Board; and all options shall terminate after such 90 days have
expired.

          (b) In the event an optionee ceases to be a member of the Board by
reason of retirement from the Board, all vested installments of such optionee's
options shall terminate on their respective expiration dates pursuant to
paragraph 6 of this Plan.  All installments of such optionee's options not
vested as of the effective date of the optionee's retirement shall continue to
vest in accordance with paragraph 7 and thereafter shall terminate on their
respective expiration dates in accordance with paragraph 6.

          (c) In the event that an optionee ceases to be a member of the Board
by reason of his or her death or permanent disability, any option granted to
such optionee shall be immediately and automatically accelerated and become
fully vested and all unexercised options shall be exercisable by the optionee
(or by the optionee's personal representative, heir or legatee, in the event of
death) until the scheduled expiration date of the option.

     9.   Exercise of Option.  Subject to the terms and conditions of this Plan
          ------------------                                                   
and the option agreements, an option granted hereunder shall, to the extent then
exercisable, be exercisable in whole or in part by giving written notice to the
Company by mail or in person addressed to Diane R. Tormey, Esq., Corporate
Counsel, Marcam Corporation, at its principal executive offices, stating the
number of shares with respect to which the option is being exercised,
accompanied by payment in full for such shares, which payment may be in whole or
in part in shares of the Common Stock of the Company already owned by the person
or persons exercising the option (subject to such restrictions and guidelines as
the Board may adopt from time to time), valued at fair market value determined
in accordance with the provisions of paragraph 5; provided, however, that there
                                                  --------  -------            
shall be no such exercise at any one time as to fewer than one hundred (100)
shares or all of the remaining shares then purchasable by the person or persons
<PAGE>
 
                                      -6-

exercising the option, if fewer than one hundred (100) shares.  The Company's
transfer agent shall, on behalf of the Company, prepare a certificate or
certificates representing such shares acquired pursuant to exercise of the
option, shall register the optionee as the owner of such shares on the books of
the Company and shall cause the fully executed certificate(s) representing such
shares to be delivered to the optionee as soon as practicable after payment of
the option price in full.  The holder of an option shall not have any rights of
a stockholder with respect to the shares covered by the option, except to the
extent that one or more certificates for such shares shall be delivered to him
or her upon the due exercise of the option.

     10.  Adjustments Upon Changes in Capitalization and Other Matters.  Upon
          ------------------------------------------------------------       
the occurrence of any of the following events, an optionee's rights with respect
to options granted to him or her hereunder shall be adjusted as hereinafter
provided:

          (a) Stock Dividends and Stock Splits.  If the shares of Common Stock
              --------------------------------                                
   shall be subdivided or combined into a greater or smaller number of shares or
   if the Company shall issue any shares of Common Stock as a stock dividend on
   its outstanding Common Stock, the number of shares of Common Stock
   deliverable upon the exercise of options shall be appropriately increased or
   decreased proportionately, and appropriate adjustments shall be made in the
   purchase price per share to reflect such subdivision, combination or stock
   dividend.

          (b) Consolidations or Mergers.  In the event of a Change in Control
              -------------------------                                      
   of the Company, each option granted under this Plan which is outstanding but
   unvested as of the effective date of the Change in Control shall become
   exercisable pursuant to Section 7(b) hereof.  In addition, the Committee
   shall make appropriate provision (to the extent permitted by Rule 16b-3 of
   the 1934 Act) in order to preserve but not exceed the value of outstanding
   options, for the continuation of all outstanding options by substituting on
   an equitable basis for the shares then subject to such options the
   consideration payable with respect to the outstanding shares of Common Stock
   in connection with the Change in Control.

          (c) Recapitalization or Reorganization.  If the Company is merged,
              ----------------------------------                            
   consolidated or reorganized into or with another corporation or other legal
   person, or if the Company sells or otherwise transfers all or substantially
   all of its assets to any other corporation or other legal person, pursuant to
   which securities of the Company or of another corporation, cash or other
   property are issued with respect to the outstanding shares of Common Stock,
   and such transaction does not constitute a Change in Control, a holder of an
   option upon exercising an option shall be entitled to receive for the
   purchase price paid upon such exercise the securities, cash or other property
   he would have received if he had exercised his option prior to such merger,
   consolidation, reorganization or sale.

          (d) Issuances of Securities.  Except as expressly provided herein, no
              -----------------------                                          
   issuance by the Company of shares of stock of any class, or securities
   convertible into shares of stock of any class, shall affect, and no
   adjustment by reason thereof shall be made with respect to, the number or
   price of shares subject to options.  No adjustments shall be made for
   dividends paid in cash or in property other than securities of the Company.
<PAGE>
 
                                      -7-

          (e) Adjustments.  Upon the happening of any of the foregoing events,
              -----------                                                     
   the class and aggregate number of shares set forth in paragraphs 2, 4 and 7
   of this Plan that are subject to options which previously have been or
   subsequently may be granted under this Plan shall also be appropriately
   adjusted to reflect such events.  The Board shall determine the specific
   adjustments to be made under this paragraph 10 and its determination shall be
   conclusive.

     11.  Restrictions on Issuance of Shares.  Notwithstanding the provisions of
          ----------------------------------                                    
paragraphs 4 and 9 of this Plan, the Company shall have no obligation to deliver
any certificate or certificates upon exercise of an option until one of the
following conditions shall be satisfied:

          (i)   The shares with respect to which the option has been exercised
   are at the time of the issue of such shares effectively registered under
   applicable Federal and state securities laws as now in force or hereafter
   amended; or

          (ii)  Counsel for the Company shall have given an opinion that such
   shares are exempt from registration under Federal and state securities laws
   as now in force or hereafter amended; and the Company has complied with all
   applicable laws and regulations with respect thereto, including without
   limitation all regulations required by any stock exchange upon which the
   Company's outstanding Common Stock is then listed.

     12.  Representation of Optionee.  If requested by the Company, the optionee
          --------------------------                                            
shall deliver to the Company written representations and warranties upon
exercise of the option that are necessary to show compliance with Federal and
state securities laws, including to the effect that a purchase of shares under
the option is made for investment and not with a view to their distribution (as
that term is used in the Securities Act of 1933).

     13.  Option Agreement.  Each option granted under the provisions of this
          ----------------                                                   
Plan shall be evidenced by an option agreement in such form as may be approved
by the Board, which agreement shall be duly executed and delivered on behalf of
the Company and by the optionee to whom such option is granted.  The option
agreement shall contain such terms, provisions and conditions not inconsistent
with this Plan as may be determined by the Board.

     14.  Termination and Amendment of Plan.  Options may no longer be granted
          ---------------------------------                                   
under this Plan after April 29, 2001, and this Plan shall terminate when all
options granted or to be granted hereunder are no longer outstanding.  The Board
may at any time terminate this Plan or make such modification or amendment
thereof as it deems advisable; provided, however, that the Board may not,
                               --------  -------                         
without approval by the affirmative vote of the holders of a majority of the
shares of Common Stock present in person or by proxy and entitled to vote at the
meeting, (a) increase the maximum number of shares for which options may be
granted under this Plan or the number of shares for which an option may be
granted to any participating director hereunder, (b) change the provisions of
this Plan regarding the termination of the options or the times when they may be
exercised, (c) change the period during which any options may be granted or
remain outstanding or the date on which this Plan shall terminate, (d) change
the designation of the class of persons 
<PAGE>
 
                                      -8-

eligible to receive options, or otherwise change paragraph 4, (e) materially
increase benefits accruing to option holders under this Plan, or (f) amend this
Plan in any manner which would cause Rule 16b-3 to become inapplicable to this
Plan; and provided further that the provisions of this Plan specified in Rule
          -------- -------     
16b-3(c)(2)(ii)(A) may not be amended more than once every six months, other
than to comport with changes in the Internal Revenue Code, the Employee
Retirement Income Security Act, or the rules thereunder. Termination or any
modification or amendment of this Plan shall not, without consent of a
participant, affect his or her rights under an option previously granted to him
or her.

     15.  Governing Law.  The validity and construction of this Plan and the
          -------------                                                     
instruments evidencing options shall be governed by the laws of The Commonwealth
of Massachusetts, without giving effect to the principles of conflicts of law
thereof.
<PAGE>
 
                                      -9-

<TABLE>
<S>                                           <C>
Date Approved by Board of Directors:          April 30, 1991
 
Date Approved by Stockholders:                February 13, 1992
 
Dates Amended by Board of Directors:          November 6, 1991
                                              November 14, 1995
                                              September 18, 1996
 
Dates Amendments Approved by Stockholders:    February 13, 1996
                                              February __, 1997
</TABLE>