These are some programs that I've written for the Texas Instruments TI83+ series of graphing calculators.
SINkit: A z80 assembly program for verifying SIN numbers and creating random ones.
TI forth: Some beta code for an onboard TI83+ forth compiler/interpreter. Status: Works. You can load up an interactive forth environment and write, compile, and execute forth programs on-board your TI. Still needs a way to save and load forth programs from flash memory.