GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Dozuki - Dozuki is a web-based tool for creating and distributing step-by-step documentation.
MkDocs - Project documentation with Markdown.
ClassVR - VR Training Simulator
Docusaurus - Easy to maintain open source documentation websites
ScreenSteps - IT Training Docs For Your Cloud Implementation. Use ScreenSteps when your company implements new cloud technology and you need training docs