What are some alternatives?
TiddlyWiki - TiddlyWiki — a non-linear personal web notebook
MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Confluence - Confluence is content collaboration software that changes how modern teams work
Nuclino - Nuclino is a unified real-time workspace for teams that brings all your notes, tasks, and docs together in one place.
Jama Connect - Collaborate with your team and share the data you care about in one place
BookStack - An open source knowledge management application that's focused on ease of use.