Facebook Design - Devices - Images and Sketch files of popular devices.
Anima App - Design, get feedback, convert to code, publish, iterate.
Device Shots - Generate high-resolution device mockups using a screenshot.
Loom - Loom is a screen recording extension for Chrome that gives people the ability to create and share media. Create your own videos using your camera, screen view, and audio. Read more about Loom.
Clay Mockups - Free set of beautiful device mockups for your designs
Marvel for Sketch - Sync, play and record prototypes in Sketch!