For a long time I’ve had a pretty cute Galaxy Generator (on this site) that randomly generates a galaxy and displays it using bound SVG elements. It’s pretty cool and in modern browsers on modern laptops, maxing out the star count doesn’t fry your computer.
Anyway, I recently rewrote example to use babylonjs instead of SVG to render the galaxy, and now the bottleneck is actually generating the data.
Anyway, it’s pretty cool looking. The user experience needs more work.