Edge
ThisIsLike.Com - The Associative Knowledge Network.
Stack Overflow
Tender Support — Support your product: Knowledge Base, Helpdesk, Forums
Freebase
GlobalWebIndex | Know Your Audience
WorkFlowy - Organize your brain.
Google Researchers Introduce System To Rank Web Pages On Facts, Not Links
Genius | Annotate the World
Knowledge base software - Helpjuice
Lessons Learned Server
Confluence - Team Collaboration Software | Atlassian
Client Portal, File Sharing, Teamwork & Collaboration platform
TiddlyWiki — a non-linear personal web notebook
tiddlyspace - bring your thoughts to life
Bloomfire Knowledge Sharing Software - Bloomfire