Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Screenshot Tracker - Capture and keep track of full-sized web page screenshots
Snagit - Screen Capture Software for Windows and Mac
Webshot - Free and Open Source screenshot website service
LightShot - The fastest way to take a customizable screenshot.
Screenstab - A tool to turn ordinary screenshots into beautiful image assets