Raytracer was the thing that sprang to mind for me. Currently the only two I have left to do on the list are the Basic compiler and the spreadsheet. I plan to

Raytracer was the thing that sprang to mind for me. Currently the only two I have left to do on the list are the Basic compiler and the spreadsheet. I plan to do the compiler quite soon, once the emulator IDE is nice enough. If I decide to do a Basic without line numbers I'll probably be doing another text editor as well. Not sure if I could bring myself to write a spreadsheet. I feel queasy just looking at them.