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
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Google Drive - Access and sync your files anywhere
Tabbles - Tabbles use tags to organize and find files along with your colleagues.
Mega - Secure File Storage and collaboration
allTags - allTags is a free, tag based file management application.