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.
Google for Education - Google for Education takes the cast analytical knowledge of Google and transforms it into a platform that educators can use to better communicate with their students in innovative ways.
Dropbox - Online Sync and File Sharing
Lockdown Browser - LockDown Browser prevents cheating during proctored online exams. Learn how it integrates with Blackboard Learn, Canvas, Brightspace, Moodle, and more.
Google Drive - Access and sync your files anywhere
Academia.edu - Academia is a website where you can share papers that are written with other users. You can use a Google or Facebook account to sign in to the website.
Mega - Secure File Storage and collaboration