PSD to Sketch Design Converter - Convert a Photoshop design to a layered Sketch file for free
Frames for Sketch - Create awesome websites & apps using powerful design system
Zeplin - Collaboration app for UI designers & frontend developers
Sketch Confetti - Generate gorgeous confetti patterns in 1 click.
Sketch Repo - Collection of resources for anyone who uses Sketch
Auto-Layout for Sketch - Responsive design for Sketch