Apposaurus: Emulate a Ti-89 calculator right on your phone! Perfect for calculus, algebra, or any long form equations. It also lets you install your own apps right on the emulator. This app alone will not work without the firmware support added, so get that as well.
Graph 89 - Emulator for the TI-89 graphing calculator.
The ROM image is not included. You need to extract this from you own calculator. Make sure you have the ROM ready before downloading this emulator.