Greenshot is a free open source screenshot utility.

Lightshot is the fastest way to take a customizable screenshot. Simple interface, nothing useless and light weight.

FireShot makes full web page screenshots.

DuckLink Screen Capture is a screen capture software.

Easy Screen Capture and Annotation is a screenshot tool.

FastStone Capture is a powerful, lightweight, yet full-featured screen capture tool and screen video recorder.

Skitch makes taking, annotating, and sharing screenshots or images is as fun as it is simple.

Gyazo is an open source screenshot program for Windows, Mac OS X and Linux.

Grabilla is a software that takes a screenshot of the user's computer screen and uploads it to the Web, FTP, computer or copy to clipboard.