ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Full Page Screen Capture - I built a Chrome Extension that allows you to save a screenshot of an entire webpage as an image
Thum.io - A real-time website screenshot generator
Screenshot Bin - Generate website screenshots and thumbnails at scale, right from your app. Screenshots as a service.
Picmaker - Design the Future
Screenshot Tracker - Capture and keep track of full-sized web page screenshots