Facebook Design - Devices - Images and Sketch files of popular devices.
Isometric - Create beautiful, abstract works of art & optical illusions
Design Cell - Beautiful multipurpose mockups for iOS
MagicPattern - The best design toolbox with 10+ tools for anyone
Clay Mockups - Free set of beautiful device mockups for your designs
Indie Boost - A video game discovery software used by Publishers, Press, YouTubers, and Streamers.