Git Sketch Plugin - Version control for designers
Fluid for Sketch - Sketch plugin to make your responsive designs more efficient
Connection Flow Arrows - Create connected arrows for sitemaps & user flows in Sketch
Sketch Plugin Course by Design+Code - Enhance your design workflow by creating a Sketch plugin
Design Systems Repo - A collection of design system examples and resources
Anima App - Design, get feedback, convert to code, publish, iterate.