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
3Cols - Manage your code snippets in the cloud fast, easy and free for personal use forever.
Google Drive - Access and sync your files anywhere
Lepton - Lepton image compression: saving 22% losslessly from images at 15MB/s
Mega - Secure File Storage and collaboration
Boostnote - Boostnote is an open-source note-taking app.