Facebook Design - Devices - Images and Sketch files of popular devices.
Facebook for Business - Facebook Business gives the latest news, advertising tips, best practices and case studies to meet the business goals.
Device Shots - Generate high-resolution device mockups using a screenshot.
Buzzstream - Build Relationships. Build Buzz. Web-based software that helps the world’s best marketers promote their products, services and content.
Clay Mockups - Free set of beautiful device mockups for your designs
Fomo - Fomo turns your site into the online equivalent of a busy store