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
skribbl - Word guessing based on drawing.
Google Drive - Access and sync your files anywhere
LetsDraw.It - Guess and Draw, Drawing Battle, Pictionary, Copy picture - online drawing games where you can compare your skill with others.
Mega - Secure File Storage and collaboration
gartic.io - Draw, guess, and win!