DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
Doxygen - Generate documentation from source code
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
TiddlyWiki - a non-linear personal web notebook
Docsify.js - A magical documentation site generator.