Agenda - A date-focused note taking app for both planning and documenting your projects.
MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Notepin - Extremely simple note-taking + blogging ✍️
TiddlyWiki - a non-linear personal web notebook
Bear - Bear.app is a note-taking and content writing app that helps you boost productivity with its intuitive tools.
Confluence - Confluence is content collaboration software that changes how modern teams work