Mock Magic is a free, easy-to-use device mockup generator that is capable of generating high-resolution device mockups instantly. Your designs are never uploaded and always stay only on your device.
MockMagic's answer:
Mock Magic is very easy to use. It generates instant mockups, no waiting time
Facebook Design - Devices - Images and Sketch files of popular devices.
Mockup Generator - Create attractive product screenshots with just a few clicks
Smartmockups - Create stunning product mockups, easily and online.
Mockly - Stunning ebook mockups in minutes
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Mockup Generator by Pixeltrue - Create beautiful product mockups in just a few clicks