Device Shots - Generate high-resolution device mockups using a screenshot.
ShareIt by SocialPilot - Free Content Curation and Influencer Discovery Tool
Facebook Design - Devices - Images and Sketch files of popular devices.
The Content Odyssey Newsletter - Every other week I discuss one B2B content experiment
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
INDX - INDX is a focused place for self-directed learning.