Dropbox - Online Sync and File Sharing
SugarSync - SugarSync is a cloud file sharing, file sync and online backup service that is simple, powerful and easy to use. Get a 30 day free trial!
Mega - Secure File Storage and collaboration
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
Google Drive - Access and sync your files anywhere
ShareFile - Secure file sharing and sync