Yammer - Yammer is a leading enterprise social network used by more than 200,000 companies worldwide, including 85% of the Fortune 500, to get work done smarter and faster. Sign Up Today.
Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
MS SharePoint - Share, organize, and discover information with Microsoft SharePoint. Learn about SharePoint Online, OneDrive for Business, and Apps for SharePoint
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
Communifire - Enterprise Social Collaboration Software
Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.