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.
Udemy - Online Courses - Learn Anything, On Your Schedule
Dropbox - Online Sync and File Sharing
Adobe Captivate Prime LMS - Adobe Captivate Prime LMS is easy to setup and helps in delivering engaging learning experiences in a personalized manner across devices.
Google Drive - Access and sync your files anywhere
Moodle - Moodle is the world's most popular learning management system. Start creating your online learning site in minutes!
Mega - Secure File Storage and collaboration