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

Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.

Screenzy - A simple screenshot beautifier

Shutter - Shutter is a feature-rich screenshot program.

Xnapper - Take beautiful screenshots instantly

Snipping Tool - Use Snipping Tool to capture a screen shot, or snip, of any object on your screen, and then annotate, save, or share the image