MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Submit Checklist - Checklist of directories to submit your startup
TiddlyWiki - a non-linear personal web notebook
Manager checklist - Cheatsheet of things every manager should do
Confluence - Confluence is content collaboration software that changes how modern teams work
Checklistomania - Centrally managed todo lists for complex processes