shotsnapp - Create beautiful device mockup presentation
Device Shots - Generate high-resolution device mockups using a screenshot.
Gfxtra - Gfxtra is a free web-based platform that is created for designers who want to get new ideas and designs.
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Dimmy.Club - Device mockup generator for your website and app screenshots
Screen Size Map - An interactive map of screen sizes for responsive web design