Francesco Pirozzi's TI Page
- Math and engineering programs as well as games for the TI-89.
- http://digilander.libero.it/fpirozzi/english.htm

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.
- http://technicalc.org/bbhatt/

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.
- http://education.ti.com/us/product/tech/89/apps/apps.html

DoorsOS
- Homepage of the premier shell and GUI for assembly programs on the TI-89 and TI-92+, with screenshots.
- http://doors.ticalc.org/

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.
- http://www.ti-89.org/

TI-Chess Team
- One of the premier programming groups for the TI-89, specializing in games that challenge the mind.
- http://tict.ticalc.org/