DIY Air Purifier - Build your own air purifier for under $100
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Respiray - Wearable air purifier that kills viruses with UV technology
Unity - The multiplatform game creation tools for everyone.
Cocos2d - Cocos2d
Godot Engine - Feature-packed 2D and 3D open source game engine.