Facebook Design - Devices - Images and Sketch files of popular devices.
Previewed - Beautiful mockups & graphics for your next app
Design Cell - Beautiful multipurpose mockups for iOS
iPhone Mockups by Previewed - Beautiful iPhone mockups to present your app
Clay Mockups - Free set of beautiful device mockups for your designs
Rotato 100 - Present your design in stunning 3D on the web, slide decks, app stores, social media, and more.