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.
Screenshot Tracker - Capture and keep track of full-sized web page screenshots
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Microlink screenshot - Take a screenshot of any website
MWSnap - MWSnap is basically a free to use Windows snapping tools that are used for snapping any part of the screen that is currently displaying on the front of all opened programs and windows.