Authors of PC99, a TI-99/4A emulator for the PC. Description as well as program, manulal and command module order information,

Shareware front end for PC99. Allows you to easily change modules and disks.

An open source emulator for Linux/Unix and Windows.

TUTor Tiny Implementation - an emulator of Tomy Tutor for Commodore 64 and disk drive.

A TI99 Emulator for the Macintosh, by Raphaël Nabet.