What engine is this using? Any recommendations for creating simple 3d visualizations of orbiting spheres? Something like the one from the link, but more web-na

What engine is this using? Any recommendations for creating simple 3d visualizations of orbiting spheres? Something like the one from the link, but more web-native (instead of python)?: https://trinket.io/glowscript/a90cba5f40 https://trinket.io/glowscript/a90cba5f40