Thum.io - A real-time website screenshot generator
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Microlink screenshot - Take a screenshot of any website
Snagit - Screen Capture Software for Windows and Mac
Screenshot Tracker - Capture and keep track of full-sized web page screenshots
LightShot - The fastest way to take a customizable screenshot.