AppLaunchpad - Create free beautiful screenshots for App store/Google play
Full Page Screen Capture - I built a Chrome Extension that allows you to save a screenshot of an entire webpage as an image
Smartmockups - Create stunning product mockups, easily and online.
Webshot - Free and Open Source screenshot website service
Placeit - Generate realistic product shots in seconds
Geekflare Screenshot API - Take a full page screenshot of any site from multiple locations whether it be via desktop, mobile or tablet