Frames for Sketch - Create awesome websites & apps using powerful design system
Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
uiprint - Printable templates of mockup, wireframes and sketchpads
Craftwork - A collection of User Interface resources made by Craftwork
Platforma - Wireframe library of layouts and UI elements
Streamline - Streamline is a web-based vacation rental software that manages vacation rental properties with flipkey integration, online booking, lead management, credit card processing, etc.