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
OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.
Google Drive - Access and sync your files anywhere
Dropbear SSH Server and Client - Dropbear is a relatively small SSH 2 server and client.
Mega - Secure File Storage and collaboration
zFTPServer Suite - zFTPServer Suite is a user friendly and easy to use FTP server.