Facebook Design - Devices - Images and Sketch files of popular devices.
WPDASH - WPDASH is a multifunctional manager for unlimited WordPress sites.
Clay Mockups - Free set of beautiful device mockups for your designs
Google Sites - Access Google Sites with a free Google account (for personal use) or G Suite account (for business use).
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Nextsale - Nextsale makes users feel the experience of shopping in a dynamic website.