Pure is a very lightweight Web Framework by Yahoo, which comes with minified and high compressed CSS modules. The complete core take only a size of 4.5 KB, but leaves nothing to be desired, in terms to the range of the offered web tools. The delivered Skin Builder helps you to build your favorite CSS style without without much knowledge of programming skills. Another fine feature is the YUI Library, a opensource CSS and JavaScript library for the development of interactive web applications. Overall a helpful application, which is thereby free. Pure is available on GitHub. All download links are included on documentation website.