Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
TiddlyWiki - a non-linear personal web notebook
Nuclino - Nuclino is a unified real-time workspace for teams that brings all your notes, tasks, and docs together in one place.
Confluence - Confluence is content collaboration software that changes how modern teams work
XWiki - A powerful Open Source collaborative platform enhancing collaboration and communication.
Jama Connect - Collaborate with your team and share the data you care about in one place