For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
CKFinder - CKFinder is a powerful and easy to use Ajax file manager for web browsers.
Dropbox - Online Sync and File Sharing
Flmngr - Free PHP File Manager
Google Drive - Access and sync your files anywhere
Tiny File Manager - Web based File Manager in PHP, Manage your files efficiently and easily with Tiny File Manager
Mega - Secure File Storage and collaboration