UI Libraries by Shuffle - A marketplace for busy front-end developers
Anima App - Design, get feedback, convert to code, publish, iterate.
DevRes - Get well VERSED in Frontend development (and more)
Sketch Repo - Collection of resources for anyone who uses Sketch
Frontendor - Library of reusable HTML blocks to help you build landing pages quickly and easily by COPY-PASTE
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.