Frames for Sketch - Create awesome websites & apps using powerful design system
Invision - Prototyping and collaboration for design teams
uiprint - Printable templates of mockup, wireframes and sketchpads
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Platforma - Wireframe library of layouts and UI elements
Craftwork - A collection of User Interface resources made by Craftwork