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.
Dropbox - Online Sync and File Sharing
Communifire - Enterprise Social Collaboration Software
Google Drive - Access and sync your files anywhere
LS Intranet - LS Intranet is a corporate intranet that facilitates multiple employees collaborating on projects, and working in synergy.
Mega - Secure File Storage and collaboration
Unily - Unily is a cloud-based intranet solution designed by SharePoint consultancy BrightStarr.