Rapier, alongside https://nalgebra.org/ (which it uses underneath) has seriously good documentation and some advanced features like cross-platform determinism (something made hard by the way floating point differs between platforms)
Been interesting to see the technique development over the release. People discovering jammed pipes and item combinations with some pretty clear progression of ideas among designs. One halfpipe, and then a bunch of loopdy-loops.
If Munroe, Goodhart, davean et. al. read this, one cool addition would be object hard points on other objects for attachments. Like a steering wheel with rotating repulsors. Fan speed adjustment would also be nice like the repulsor strength.
