ShareX

ShareX (formerly known as ZScreen) is a free and open-source program for Microsoft Windows that enables screen capture.

ShareX is primarily intended for advanced users, developers and testers. It is used to create screenshots of the screen or just a part of it. The captured image can be annotated and edited using the built-in image editor, or it can be customized with effects.

Most importantly, it allows you to quickly and easily take a screenshot and upload it to over 30 hosting services such as Imgur, FTP, Dropbox, Mega and Pastebin.