zedgoat
zedgoat reviewedDropbox PaperCollaboration tool built for teams
 RecommendedPros: 

Clean, simple structure, perfect for case and topic management.

Cons: 

Not much yet. Drive it hard on a daily basis and love it.

Use Paper to manage technical stuff and my team, and love it. Just the right number of features, document crosslinking and image embedding fits my needs exactly, and works for quick notes or longer documents.