Frame - Easily create reallife product shot mockups.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Shadow - Transform any device into a supercharged gaming machine.
Shutter - Shutter is a feature-rich screenshot program.
MockuPhone - Easily wrap app screenshots in devices
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