Bitrix24 - Bitrix24 is a free (for small businesses) social enterprise platform. It is a united work space which handles the many aspects of daily operations and tasks. Create your own social intranet in minutes!
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.
MS SharePoint - Share, organize, and discover information with Microsoft SharePoint. Learn about SharePoint Online, OneDrive for Business, and Apps for SharePoint
PlanBox - Finally an agile management tool all teams can share, whether Scrum-savvy or not.
Communifire - Enterprise Social Collaboration Software
Samepage - Samepage facilitates communication, project management, meetings, online collaboration, and more by combining team chat, video calling, screen sharing, task management, and real-time team document collaboration in a single collaborative workspace.