Microsoft OneDrive - Secure access, sharing & file storage
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.
Dropbox - Online Sync and File Sharing
MS SharePoint - Share, organize, and discover information with Microsoft SharePoint. Learn about SharePoint Online, OneDrive for Business, and Apps for SharePoint
Google Drive - Access and sync your files anywhere
Communifire - Enterprise Social Collaboration Software