3
- osu!lazer: One of the best open source (rythm) games imo
- Pioneer: A cozy space sim
- JStris Just a multiplayer Tetris website
- Not "open source" per-se, but games on Tic80 have the code available>
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.