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.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Dropbox - Online Sync and File Sharing
Snagit - Screen Capture Software for Windows and Mac
Google Drive - Access and sync your files anywhere
LightShot - The fastest way to take a customizable screenshot.
Mega - Secure File Storage and collaboration