I recently got a idea to port Processing to Graphical Calculators.
I got the idea for implementing Processing in Graphical Calculators from KhanAcademy when I was searching for Flow Free source code: https://www.khanacademy.org/computer-programming/new/pjs
I initially planned to release the API for the Prizm SDK only, but a version for TI-84 CE might work too.
What is Processing
For those of you who don't know, Processing is a programming language ment to make coding with graphics easy. It has the capability of OpenGL but is way easier to use: https://processing.org/reference/
Where do I find it?
I don't really use Github for open-source projects, but here is the link anyway, in case you want to help:
https://github.com/YoYoYonnY/Processing
The project is still in a very early stage, but I thought better post this early than late, so here you go

Can you tell us a little bit more about what you're planning? Do you want Processing scripts to run as-is on the calculator? What inspired you to look at Processing in particular?