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
Habit List - Create good habits and break bad ones with the app that keeps you focused.
Google Drive - Access and sync your files anywhere
Momentum - Agile goal and performance management
Mega - Secure File Storage and collaboration
Streaks - The to-do list that helps you form good habits.