Software & Programming

THIS AGREEMENT made this 1 day of October, 1999, by and between Nassda
Corporation, a California corporation with its principal place of business at
625 Ellis Street, Suite 206, Mountain View, CA 94043, U.S.A. ("Company"), and
Marubeni Solutions Corporation, a Japanese corporation with its principal place
of business at Higashi 1-26-20, Shibuya-ku, Tokyo 150-0011, Japan
("Distributor").

     WHEREAS Company wishes to develop export sales of its Software products
defined below;

     WHEREAS Company wishes to appoint Distributor as Company's exclusive
distributor of its  . . .

                                   AMENDMENT TO
                        EXCLUSIVE DISTRIBUTOR AGREEMENT

THIS AMENDMENT is entered into this 21st day of November, 2000 by and between
Nassda Corporation located at 625 Ellis Street, Suite 206, Mountain View, CA
94043 ("Company") and Marubeni Solutions Corporation located at Higashi 1-26-20,
Shibuya-ku, Tokyo 150-0011, Japan ("Distributor").

     WHEREAS, Company and Distributor entered into an Exclusive Distributor
Agreement dated October 1, 1999 ("Distributor Agreement"), under which
Distributor distributes  . . .

                             DISTRIBUTOR AGREEMENT

                                    BETWEEN

                             VERISITY DESIGN, INC.

                                      AND

                             CYBERTEC YUGEN KAISHA

                      INTERNATIONAL DISTRIBUTOR AGREEMENT

    This Agreement (the "Agreement") is made and entered into effective as of
January 1, 1999 (the "Effective Date"), between Verisity Design, Inc., a
California corporation, with its principal offices at 2041 Landings Drive,
Mountain View, California 94043, U.S. . . .

                             DISTRIBUTOR AGREEMENT

                                    BETWEEN

                             VERISITY DESIGN, INC.

                                      AND

                             CYBERTEC YUGEN KAISHA

                      INTERNATIONAL DISTRIBUTOR AGREEMENT

    This Agreement (the "Agreement") is made and entered into effective as of
January 1, 1999 (the "Effective Date"), between Verisity Design, Inc., a
California corporation, with its principal offices at 2041 Landings Drive,
Mountain View, California 94043, U.S. . . .

                      INTERNATIONAL DISTRIBUTOR AGREEMENT

          THIS INTERNATIONAL DISTRIBUTOR AGREEMENT ("Agreement") is made and
entered into as of the date of the last signature to this Agreement ("Effective
Date") by and between VERISITY Design, Inc., a California corporation with
principle offices at 2041 Landing Drive, Mountain View, CA 94043 ("VERISITY")
and DAVAN TECH CO., LTD., a South Korea corporation with principle offices at
    --------------------    -----------
7th Fl., Duam Bldg., #174-6, Seokchon-Dong, Songpa-Ku, Seoul, Korea, 138- . . .

                             DISTRIBUTOR AGREEMENT

                                    BETWEEN

                             VERISITY DESIGN, INC.

                                      AND

                             CYBERTEC YUGEN KAISHA

                      INTERNATIONAL DISTRIBUTOR AGREEMENT

    This Agreement (the "Agreement") is made and entered into effective as of
January 1, 1999 (the "Effective Date"), between Verisity Design, Inc., a
California corporation, with its principal offices at 2041 Landings Drive,
Mountain View, California 94043, U.S. . . .

                      INTERNATIONAL DISTRIBUTOR AGREEMENT

          THIS INTERNATIONAL DISTRIBUTOR AGREEMENT ("Agreement") is made and
entered into as of the date of the last signature to this Agreement ("Effective
Date") by and between VERISITY Design, Inc., a California corporation with
principle offices at 2041 Landing Drive, Mountain View, CA 94043 ("VERISITY")
and DAVAN TECH CO., LTD., a South Korea corporation with principle offices at
    --------------------    -----------
7th Fl., Duam Bldg., #174-6, Seokchon-Dong, Songpa-Ku, Seoul, Korea, 138- . . .

                               SYNPLICITY, INC.
                               ----------------
                AUTHORIZED INTERNATIONAL DISTRIBUTOR AGREEMENT
                ----------------------------------------------

     This Agreement is made between Synplicity, Inc., a California corporation
with its principal place of business at 465 Fairchild Drive, Suite 115, Mountain
View, California 94043, United States of America ("Company"), and Pacific
                                                   -------
Design, Inc., a Japanese corporation maintaining its principal  . . .

<DESCRIPTION>EXHIBIT 10.16
<TEXT>

<PAGE>

                              DISTRIBUTOR AGREEMENT

THIS DISTRIBUTOR AGREEMENT is made and entered on this 15th day of June, 2000,
by and between Amiable Technologies, Inc., doing business as Scanvec Amiable, a
Pennsylvania corporation and Mutoh Industries Ltd. (herein referred to as
"DISTRIBUTOR").

RECITALS

A.    Amiable Technologies, Inc. is the sole developer and manufacturer of all
      products specified in this  . . .