SuperCollider, but I found the barrier to entry a little higher than using something like Pure Data.
But before any of that, I needed/wanted to make sure I could get my system capable of sharing sound over Zoom! As long as this was an issue, I wouldn't be able to pair with anyone on anything audio-related. Thankfully, I found an intuitive solution to my Linux audio-management woes with Patchage! Finally, I could quickly make and break connections on the fly without memorizing commands and having to query the system to see what audio interfaces were available. Unfortunately it's a wee bit unstable, but I've found I can work around that.
Later on in the week, I finally got around to learning how to make generative ambient music in Pure Data! Sure I only followed a tutorial, but I did my best to make it my own and play with different techniques, and the result was lovely (still need to decide on a way to host).
That's all for now! I wish I had the energy/focus to write more but I'm not going to force myself.