Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Facebook Design - Devices - Images and Sketch files of popular devices.
Dimmy.Club - Device mockup generator for your website and app screenshots
Device Shots - Generate high-resolution device mockups using a screenshot.
MockMagic - A free, easy-to-use device mockup generator
Mockup Generator - Create attractive product screenshots with just a few clicks