Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Nuclino - Nuclino works like a collective brain, helping teams bring all their knowledge, docs, and projects together in one place. It's a modern, simple, and blazingly fast way to collaborate.
TiddlyWiki - a non-linear personal web notebook
Jama Connect - The Leader in Requirements Management Solutions
Confluence - Confluence is content collaboration software that changes how modern teams work