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.
DocSlide - DocSlide is an online document and knowledge sharing platform.
Dropbox - Online Sync and File Sharing
SlideShare - Discover, Share, and Present presentations and infographics with the world’s largest professional content sharing community.
Google Drive - Access and sync your files anywhere
Scribd - Unlimited books, audiobooks & comics. Unparalleled discovery. Any device. $8.99/month
Mega - Secure File Storage and collaboration