Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Pygame - Pygame is a set of Python modules designed for writing games.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
MonoGame - MonoGame is an open source implementation of the Microsoft XNA 4 Framework.
V-Ray - Learn why V-Ray for 3ds Max’s powerful CPU & GPU renderer is the industry standard for artists & designers in architecture, games, VFX, VR, and more.
Godot Engine - Feature-packed 2D and 3D open source game engine.