WackoWiki - WackoWiki is a light and easy to install multilingual Wiki-engine.
MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
TiddlyWiki - a non-linear personal web notebook
Confluence - Confluence is content collaboration software that changes how modern teams work
Foswiki - Foswiki is the free and open source enterprise collaboration platform.