CaDD Electronics Home Page: Authors of PC99, a TI-99/4A emulator for the PC. Description as well as program, manulal and command module order information,
MacV9T9: A TI99 Emulator for the Macintosh, by Raphaël Nabet.
PC99 Menu: Shareware front end for PC99. Allows you to easily change modules and disks.
The Tutti Emulator: TUTor Tiny Implementation - an emulator of Tomy Tutor for Commodore 64 and disk drive.
TI-99/SIM: An open source emulator for Linux/Unix and Windows.