What software do you wish someone would build for you?

Probably, whatever one I did not have time to fully write by myself; other people can help too, I hope. For example:

- Pokemon battle simulator in C with C API.

- Implementations (and reviews) of some parts of the operating system design that I had (partially) written.

- Free bitmap fonts with TRON character code. (I have partially been able to do it, by recoding some JIS fonts.)

- Probably some others, too.

I've always wanted something like https://pingendo.com/ but OSS and would generate much more lightweight sites. I really enjoyed using Pingendo a few years back.

Multithreaded Emacs in Common Lisp. Ridiculous dream, I know, but I want it.