Invision - Prototyping and collaboration for design teams
Angle 2 Mockups - A giant Sketch Library for creating app presentations
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Velvet UI Kit - Cozy iOS UI Kit designed for Sketch 🌸
Craftwork - A collection of User Interface resources made by Craftwork
Avataaars - Mix and match avatars with a Sketch library