A small C program utilizing SDL to present a simple note-taking system that I plan to use in my college classes in my next quarter. Pretty simple app, only took me around 4-5 hours to make.
It's plug and play with a binary. Simply copy the files to the desktop of a stock Raspbian image and run.
Should be pretty expandable to other mediums as well by simply replacing the SDL code with whatever other graphics system you're using.