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.

Francisco Tolmasky, Tom Robinson and Ross Boucher developed Cappuccino Framework as basis of web applications, which are intuitive and comes in Apple's Mac OS X style. Cappuccino is written in Objective-J, a object-oriented programming language, which includes a similar syntax like Apple's Objective-C language. The realization of web applications with Cappucino is almost browser-based. Its possible to develop user interfaces by Xcode's Interface Builder. Integrated stunning controls thereby simplifying the development. Cappucchino Framework is available for free on documentation site in the latest Version, Cappucino Framework 0.9.7, 28 November 2013.

Bootstrap is surely the most popular free web framework on market. Realized by Twitter and published in 2011, this framework represent today a rich collection of design techniques, which equip you to develop responsive templates and web applications. Beside this, Bootstrap is high documented. You get a lot of CSS rules, components and customization possibilities on the Bootstrap documentation page. More over this, Bootstrap is today widespread and basis of much template- and framework realizations of free content management systems, like Joomla or WordPress. Just download it and create your own lightweight and responsive theme or app with Bootstrap.