DIY Air Purifier - Build your own air purifier for under $100
Unity - The multiplatform game creation tools for everyone.
Further - Further enables all investors to access this decades best performing asset class: venture capital.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Egret - Game Engine
Blender - Blender is the open source, cross platform suite of tools for 3D creation.