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
Shutter - Shutter is a feature-rich screenshot program.
Webshot - Free and Open Source screenshot website service
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.
Screenstab - A tool to turn ordinary screenshots into beautiful image assets