Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
MockMagic - A free, easy-to-use device mockup generator
Placeit - Generate realistic product shots in seconds
Mockup Generator - Create attractive product screenshots with just a few clicks
Mediamodifier - Create beautiful designs and product mockups in seconds.
mockDrop - Is a webapp for creating free device mockups including your screenshots.