Dozuki - Dozuki is a web-based tool for creating and distributing step-by-step documentation.
DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
ClassVR - VR Training Simulator
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
ScreenSteps - IT Training Docs For Your Cloud Implementation. Use ScreenSteps when your company implements new cloud technology and you need training docs
TiddlyWiki - a non-linear personal web notebook