ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Awesome Screenshot - Capture the whole page or any portion, annotate it with rectangles, circles, arrows, lines and...
BrowseShot - BrowseShot lets you capture a PNG of the full scrollable area of a website.
LightShot - The fastest way to take a customizable screenshot.
Paparazzi! - Paparazzi! is a small utility for Mac OS X that makes screenshots of webpages.