Unity - The multiplatform game creation tools for everyone.
Kalam Labs - Twitch for Science
Godot Engine - Feature-packed 2D and 3D open source game engine.
MathCrunch - Learn math stress free
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.