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These ISVs were active in the Post-Stryker/Worldgroup 3 era (whether or not they actively wrote Worldgroup 3 addons).
AdventureComm
AdventureComm purchased several modules (Lost Caverns/Mud Magic, Mancala, and Email Spy) from Cheersoft by way of Computerized Horizons, Biorhythm from Logicom/Cyberware, and the entire EzSoft line. In addition, Brad Farrell developed Chinese Zodiac, Chinese Chess, and Time and Date Changer. He also did custom development. AdventureComm was sold to Elwynor Technologies.
College Transfer Gate
College Transfer Gate produced PALS PALS for Worldgroup 3 Client/Server only, which provides a multiuser type and voice chat system. We do not have any contact information for College Transfer Gate.