Dozuki - Dozuki is a web-based tool for creating and distributing step-by-step documentation.
Unity - The multiplatform game creation tools for everyone.
ScreenSteps - IT Training Docs For Your Cloud Implementation. Use ScreenSteps when your company implements new cloud technology and you need training docs
Godot Engine - Feature-packed 2D and 3D open source game engine.
Poka.io - Communication and training solutions for manufacturers.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.