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.
Nibbler - Free tool for testing how good your website is, and what you can do to improve it. Check accessibility, SEO, social media, compliance and more.
Dropbox - Online Sync and File Sharing
Pennywise - Cross-platform application to open any website or media in a floating window
Google Drive - Access and sync your files anywhere
Zercurity - Monitor your infrastructure for policy non-compliance, live
Mega - Secure File Storage and collaboration