AppMockUp - Create the most compelling screenshots for your app.
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Sketch to App Store - Generate App Store images for all iPhone sizes from Sketch
Mockup Generator - Create attractive product screenshots with just a few clicks
AppLaunchpad - Create free beautiful screenshots for App store/Google play
shotsnapp - Create beautiful device mockup presentation