Device Shots - Generate high-resolution device mockups using a screenshot.
AppLaunchpad - Create free beautiful screenshots for App store/Google play
Facebook Design - Devices - Images and Sketch files of popular devices.
Pixelied Mockups - Create stunning mockup designs online in minutes
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Design Cell - Beautiful multipurpose mockups for iOS