MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
MeetNotes - Increase Productivity with Meeting Notes Tool. More effective minutes, Prepare Agenda, Collaborative Notes & Action Items.
TiddlyWiki - a non-linear personal web notebook
Chili Piper - Chili Piper is an intelligent calendar for Sales teams, to book their own meetings or set appointments for other teams.
Confluence - Confluence is content collaboration software that changes how modern teams work
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.