Waver - Description: Google Wave is a great way to communicate and collaborate. Waver lets you:
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.
Rizzoma - Email and IM are linear contextless communication tools.
MS SharePoint - Share, organize, and discover information with Microsoft SharePoint. Learn about SharePoint Online, OneDrive for Business, and Apps for SharePoint
BSI Knowledge Manager - Central document management & knowledge base
Communifire - Enterprise Social Collaboration Software