I haven’t worked on these in several months either. I made these for the fun of it.
I made this one to see if I could. So far it’s my favorite project I’ve built. Many 1-unit mass particles orbiting several heavier particles, up to 1000-unit mass. The particles are attracted to the masses but not each other. The masses orbit each other. The masses don’t combine. It uses the HTML canvas. Not optimized; your fan will go on max with this many particles.
Similar to the last one, but everything is attracted to everything. The particles’ momentum combines when they collide (approach within a minimum distance). The color changes after a collision. Not optimized; your fan will go on max with this many particles. It’s probably possible to add collision detection so the particles only check their neighbors within a certain distance.
It’s monochrome right now and has a few simple optimizations I borrowed from wikipedia. Click to re-center and use the controls to zoom in/out.