CalcWare
Programming group with assembly and basic games and programs for the TI-89.
DoorsOS
Homepage of the premier shell and GUI for assembly programs on the TI-89 and TI-92+, with screenshots.
EQW
Graphical equation editor created by E.W. for the TI-89 and TI-92+ calculators.
Francesco Pirozzi's TI Page
Math and engineering programs as well as games for the TI-89.
JCP Ti89
Assembly and basic games, science and math programs for the TI-89.
Samuel Nyall Stearley's Programs
Original TI-89 assembly programs and utilities, including Yet Another Periodic Table and Expression Writer.
T&T 89
Homepage of Visual OS, a program manager for the TI-89 with a similar interface to that of Windows.
TI-89 Flash Software
TI's page for new versions of the TI-89 Advanced Mathematics Software as well as mathematical Flash applications for it.
TI-89.org
Includes BASIC programs, a description of the calculator, an archive of games and programs with reviews, links, a FAQ, and a message board.
TI-89/TI-92 Plus
Resources for the TI-89 and TI-92 plus calculators, computers and includes some packages and links to other useful resources.
TI-Chess Team
One of the premier programming groups for the TI-89, specializing in games that challenge the mind.