MockMagic - A free, easy-to-use device mockup generator
Invision - Prototyping and collaboration for design teams
Dimmy.Club - Device mockup generator for your website and app screenshots
PAQATO - The PAQATO After-Sales Experience Platform is the growth driver that makes online stores successful for tomorrow.
Mockup Generator by Pixeltrue - Create beautiful product mockups in just a few clicks
Glyphish - Awesome mobile app icon collection for designers/developers