Dozuki - Dozuki is a web-based tool for creating and distributing step-by-step documentation.
MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
ClassVR - VR Training Simulator
TiddlyWiki - a non-linear personal web notebook
ScreenSteps - IT Training Docs For Your Cloud Implementation. Use ScreenSteps when your company implements new cloud technology and you need training docs
Confluence - Confluence is content collaboration software that changes how modern teams work