Base UI Sketch Framework - Huge set of everything you need to design and prototype
Supernova Studio - The world’s first true design-to-code platform 🚀
INSTAD.IO - Automagically converts vector images into sketchy style
Anima App - Design, get feedback, convert to code, publish, iterate.
Sketch Extensions - An official collection of Sketch extensions & plugins
Git Sketch Plugin - Version control for designers