ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...

Screely - Screely instantly generates dribbble-ready images. Simply upload your screenshot and we'll do the rest.

Thum.io - A real-time website screenshot generator

Annotable - Ultimate image annotation & markup tool

Blink - Blink is a team and employee app, with a Feed, Chat and Hub (for documents, links, files).

Screenzy - A simple screenshot beautifier