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.
Sencha Ext JS - Sencha Ext JS is the most comprehensive JavaScript framework for building data-intensive, cross-platform web and mobile applications for any modern device. Ext JS includes 140+ pre-integrated and tested high-performance UI components.
Dropbox - Online Sync and File Sharing
jQuery - The Write Less, Do More, JavaScript Library.
Google Drive - Access and sync your files anywhere
Harp - The static web server with built-in preprocessing.
Mega - Secure File Storage and collaboration