- https://github.com/overtone/overtone - https://xtdb.com/ - https://github.com/kennytilton/matrix - https://github.com/metasoarous/oz
It's using SuperCollider under the hood (https://supercollider.github.io/) which describes itself as "A platform for audio synthesis and algorithmic composition"
You can pretty much achieve anything in terms of programmable music composition with Overtone/SuperCollider.
- r/musicprogramming [1]
- #opensourcemusicians on the Freenode IRC network [2]
- VCV Rack [3]
- Supercollider [4]
- Overtone [5]
- ChucK [6]
- Awesome live-coding [7]
- Muffwiggler Forum [8]
[1] - https://old.reddit.com/r/musicprogramming/
[2] - https://freenode.net/
[3] - https://vcvrack.com/
[4] - https://supercollider.github.io/
[5] - https://github.com/overtone/overtone
[6] - https://chuck.cs.princeton.edu/
[7] - https://github.com/pjagielski/awesome-live-coding-music