EXHIBIT 99.1 AGREEMENT AND PLAN OF MERGER BY AND AMONG WEBMETHODS, INC. WOLF ACQUISITION, INC. AND ACTIVE SOFTWARE, INC. DATED AS OF MAY 20, 2000 TABLE OF CONTENTS -----------------Agreement and Plan of Merger • May 30th, 2000 • Active Software Inc • Services-computer integrated systems design • Delaware
VOTING AGREEMENT ----------------Voting Agreement • May 30th, 2000 • Active Software Inc • Services-computer integrated systems design • Delaware
