Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Sketch - Professional digital design for Mac.
Smartmockups - Create stunning product mockups, easily and online.
Invision - Prototyping and collaboration for design teams
MockMagic - A free, easy-to-use device mockup generator