Unity - The multiplatform game creation tools for everyone.
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Godot Engine - Feature-packed 2D and 3D open source game engine.
DocFX - A documentation generation tool for API reference and Markdown files!
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Docusaurus - Easy to maintain open source documentation websites