Emulators

GtkTiEmu
An open source TI-89, TI-92, and T-92+ emulator for Linux and Windows.
http://sourceforge.net/projects/gtktiemu/

TI 85 Emulator for Unix/Linux
An open source emulator for Linux/Unix.
http://project.terminus.sk/ti85emu/

Tiger Homepage
A TI-92 emulator written in C for both Windows and Macintosh systems.
http://www.student.nada.kth.se/~md94-jmi/tiger/