Community Questions for Confluence - Keep questions and answers in one place with an engaging, community-driven Q&A discussion forum, powered by Confluence
Double 2 - Giving you a physical presence when you can’t be there
Stack Overflow for Teams - Everything you love about Stack Overflow in a private space.
Perch - A bird’s eye view of social activity for you AND your competition.
Question2Answer - A Q&A site helps an online community to share knowledge.
Nudee - Create a 3D printed "nude selfie" (slightly NSFW)