MockMagic - A free, easy-to-use device mockup generator
Invision - Prototyping and collaboration for design teams
Platforma for iOS - The ultimate wireframe kit for app prototyping
PAQATO - The PAQATO After-Sales Experience Platform is the growth driver that makes online stores successful for tomorrow.
Smart Watch UI Kit - Helps smartwatch designers to design easily, 52 design
Glyphish - Awesome mobile app icon collection for designers/developers