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.
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
MS SharePoint - Share, organize, and discover information with Microsoft SharePoint. Learn about SharePoint Online, OneDrive for Business, and Apps for SharePoint
Bigtent - BigTent is a web-based organization and communication portal for groups.
Communifire - Enterprise Social Collaboration Software
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.