I am mostly continuing to work on Super ZZ Zero, which is a game engine, like ZZT and MegaZeux in many ways. The program is FOSS and is written in C.
I also have some ideas of a programming language designed mainly to process files in DER format (as well as data from stdin and to stdout), but have not actually implemented anything so far.
I also have ideas about an operating system design and computer design, and should have help to write the specification properly, and then it can be implemented afterward.