A couple of not so recent pages made with three.js
Using OBJ models converted to JSON using the Python script (or at least it was Python at the time!). I still don't know how to make dynamic particle systems using models like Jaume Sanchez Elias does.
Click on each image to start the WebGL page (opens in a new tab).
In a second attempt, I made a basic simulation of the solar system by mapping the textures of each planet to Three.Sphere() sized accordingly.
All the planets should be orbiting around themselves and around the Sun at the appropriate relative speeds.