Blender is the Open Source 3D creation software. Free to use for any purpose, forever.
Wolfprint 3D is creating realistic 3D avatars of people for VR and games. Our first product is an automatic 3D scanning booth that allows anyone to create a truly realistic avatar of themselves easily.
TheoremJS is a mathematical framework that is packed up with tons of useful mathematical functions. It is composed of functions in most mathematical fields such as algebra, number theory, statistics, etc... It was designed to fit your need, whatever you are trying to do.