XWiki - A powerful Open Source collaborative platform enhancing collaboration and communication.
MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
TiddlyWiki - a non-linear personal web notebook
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
Confluence - Confluence is content collaboration software that changes how modern teams work
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.