Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Thum.io - A real-time website screenshot generator
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
LightShot - The fastest way to take a customizable screenshot.
Full Page Screen Capture - I built a Chrome Extension that allows you to save a screenshot of an entire webpage as an image