Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Mediamodifier - Create beautiful designs and product mockups in seconds.
Sketch - Professional digital design for Mac.
mockDrop - Is a webapp for creating free device mockups including your screenshots.
Invision - Prototyping and collaboration for design teams