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.
Slackin - Create your own public Slack chat community
Dropbox - Online Sync and File Sharing
Hamster Pad - A social network built on top of Slack
Google Drive - Access and sync your files anywhere
Collaborus Cloud - Collaborus Cloud is a policy administration software that helps small insurers to lower their operating cost and grow their digital distribution.
Mega - Secure File Storage and collaboration