Flinto - The prototyping tool designers have been waiting for.
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Base UI Sketch Framework - Huge set of everything you need to design and prototype
Placeit - Generate realistic product shots in seconds
Glyphy - Copy & paste fancy fonts + cool symbols ☞✺✐™
Mediamodifier - Create beautiful designs and product mockups in seconds.