Amarillo Users Group: Amarillo 99/4A Users Group Tribute Page
Massachusetts Users of the Ninety-nine and Computer Hobbyists: Membership Information.
Portland Users of Ninety Nine: Newsletter, BBS system, TI/PC99/PC articles, membership information.
Projekte und Software der system 99 user-group: German System 99 User Group (SNUG) - page with English versions of software and documentation.
Site of the dutch TI Users Group: Information for the users of the TI-99/4A and Geneve computer. Hardware and software, meetings and club-news.
The Milwaukee Area TI User Group: Membership information, meeting information, links.
The UK TI99 Users Group: Emulates a TI-99/4A with group information and links.
TI Chips Cleveland Area User Group: Cleveland Area User Group that still meets every third Saturday at the North Royalton Ohio public library. Site includes article and newsletter archive.