ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Dropbox - Online Sync and File Sharing
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
LightShot - The fastest way to take a customizable screenshot.
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.