3D Model Creation

There are several great free options to create 3D models if you cannot find existing models (See the 3D resources page)

Google Blocks allows you to create directly in Virtual Reality, and you can easily export your models to Unity using Google Poly

Google Tiltbrush allows you to paint in Virtual Reality, and is great for uses such as drawing out math problems or creating elaborate paintings. You also can use Google Poly to export the models to Unity.

Blender is free and open source and has a huge community behind it, and can be used to easily create 3D models on desktop.