Some ideas that come to mind:
- Programming Language Design
- System Programming
- Miscellaneous Programming (could just be called "programming")
- Procgen
- Hardware
I have some other ideas that lean towards being more social stuff like Jams (not just game jams, but also procgen and general collabs on short scrappy projects) and Demo/Showcase. Could probably roll those into off topic.
For languages, I feel like the convention shoud be like #programming [C] ...
or #resource [Lua] ...
rather than individual tags. Everyone is gonna want their language to have a tag and that could clutter things.