They're using Three.js, but it looks like the spinning icosahedron is custom-made with about 300 lines of code. That includes calculating the vertices of the ic

They're using Three.js, but it looks like the spinning icosahedron is custom-made with about 300 lines of code. That includes calculating the vertices of the icosahedron, loading the model from a 3D model file, setting up the surface material characteristics, setting up the lights, animation, moving HTML nodes with the labels along with the vertices, and mouse dragging.