There are many things that I had wanted to find which are not commonly available in FOSS, or are difficult to find, or are just not available at all:
- Simple music playback library like MOD/S3M/IT/XM formats but you will provide your own command stream and instruments (including possibility of non-12-TET music) instead of loading from any file format.
- Non-Unicode SQLite. (Non-Unicode can greatly improve speed of some functions, as well as making some operations considerably less messy.)
- Fonts of TRON character set (especially bitmap (screen) fonts and PostScript fonts). (There does not seem to be a good way to do it with TrueType, although with bitmap fonts it could easily be done, and anyways I like to have bitmap fonts.)
- Program you can other non-Xaw GUIs with Xaw. (Or, a better GUI, like Xaw is; none of the other ones used these days have its features and otherwise like it; in my opinion they are just made mostly worse)
- A Pokemon battle simulator library in C.
- FOSS implementation of BTRON. (There is one called B-Free which unfortunately seems to be incomplete and abandoned. I had forked and only made a single change so far, which is adding the D (64-bit) type. If date/time type is then D instead of W, then the year 2053 problem can be avoided.)
- Zoned spreadsheet.
(I had done a few things related to some of the above, but not much.)