Device Shots - Generate high-resolution device mockups using a screenshot.
Marvel for iOS - Rapid design and prototyping for the iPhone and iPad
Facebook Design - Devices - Images and Sketch files of popular devices.
Peetch - The last PowerPoint Pitchdeck you’ll ever need
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Keynotopia - Prototyping straight into Keynote or Powerpoint