A powerful alternative named HTML KickStart which is a HTML5, CSS and jQuery-powered toolkit for easily creating any type of layouts with web elements in-rhythm.

It has styles for grids, typography, forms, buttons, tables or lists and cross-browser eb elements like a JavaScript gallery, lightbox, breadcrumb navigation, menus with sub-menus and more.

Kendo UI is a framework for modern HTML UI. Engineered with the latest HTML5, CSS3, and JavaScript standards, it delivers everything needed for client-side, jQuery-powered development in one integrated, compact package.

HTML5 audio and video is really great and very easy-to-use, however, they are not supported in older browsers and there isn't a consistency between modern browsers when it comes to file types.

html5media is a JavaScript library that enables every browser to play the media defined inside the HTML5 media tags.