It obviously won’t work for everyone, but for remote access I’ve been very impressed with waypipe. I use it to pull windows from headless machines onto my main workstation, like X forwarding.

I’d like something for persistence, like wprs, but it’s not quite there yet.

Suicidally bad naming is the one thing we can always rely on Microsoft for

For something pretty low level and gigantic, Mesa (or at least RADV) is a pleasure to hack on. It has a great config system (meson), compiles super fast, has lots of debug functionality, and can easily be loaded into e.g. a game, without any system level configuration.