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
Confluence - Confluence is content collaboration software that changes how modern teams work
Google Drive - Access and sync your files anywhere
Slack - A messaging app for teams who see through the Earth!
Mega - Secure File Storage and collaboration
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.