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.
Beyond Compare - Beyond Compare allows you to compare files and folders.
MS SharePoint - Share, organize, and discover information with Microsoft SharePoint. Learn about SharePoint Online, OneDrive for Business, and Apps for SharePoint
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Communifire - Enterprise Social Collaboration Software
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.