Open Designs - Open Designs is an open source web design gallery with over 2000 free website templates that help to make the global internet a prettier place.
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
WrapBootstrap - WrapBootstrap is a marketplace for premium Bootstrap themes and templates.
Primer - CSS toolkit and guidelines that power GitHub
ThumbZilla - Awesome thumb stomping and kicking action game.
UIKit - A lightweight and modular front-end framework for developing fast and powerful web interfaces