Humaaans - Mix-&-match illustrations of humans with a design library.
Device Shots - Generate high-resolution device mockups using a screenshot.
Handsome Illustrations - Create unique illustrations for websites & applications.
Facebook Design - Devices - Images and Sketch files of popular devices.
Blush - Illustrations for everyone
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.