Sketch Confetti - Generate gorgeous confetti patterns in 1 click.
PSD to Sketch Design Converter - Convert a Photoshop design to a layered Sketch file for free
Atomize - The most advanced Design System for Sketch
Sketch Repo - Collection of resources for anyone who uses Sketch
Merge Duplicate Symbols - Automatically find and act on duplicate symbols in Sketch
Zeplin - Collaboration app for UI designers & frontend developers