The TI-Nspire is a pretty cool graphing calculator. It has a color display and lets you graph and study 3D functions. You can do more with it than just calculating numbers. As the below video shows, it is possible to run Android on the TI-Nspire to play games and do other fun things:
As Josh Max mentions on YouTube, the code for this project is available on GitHub. Porting Android to the Ti NSpire CX may not be the best idea, but it’s nice to have the option.