Thum.io - A real-time website screenshot generator
Webshot - Free and Open Source screenshot website service
Screenlapse - Automatically capture website screenshots every day/week/etc
Full Page Screen Capture - I built a Chrome Extension that allows you to save a screenshot of an entire webpage as an image
Screely - Screely instantly generates dribbble-ready images. Simply upload your screenshot and we'll do the rest.
LambdaTest - Perform Web Testing on 2000+ Browsers & OS