Full Page Screen Capture - I built a Chrome Extension that allows you to save a screenshot of an entire webpage as an image
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Webshot - Free and Open Source screenshot website service
Mediamodifier - Create beautiful designs and product mockups in seconds.
Screenshot Designer - Create engaging App Store screenshots
mockDrop - Is a webapp for creating free device mockups including your screenshots.