SequoiaView - SequoiaView is a featured rich application that comes with the visualization technique to provide you a single view of files and documents that are stored in your hard drive.
Google Drive - Access and sync your files anywhere
DiskBoss - A file manager with a focus on storage side of things: Monitoring, classing, storage, duplicate...
Dropbox - Online Sync and File Sharing
DiskWave - DiskWave is a free utility to help you determine where most of your hard drive space is consumed.
ShareFile - Secure file sharing and sync