xCSS : xCSS bases on CSS and empowers a straightforward and object-oriented workflow when developing complex style cascades.
Phalcon PHP : Phalcon is a web framework implemented as a C extension offering high performance and lower resource consumption.
Symfony : Symfony is a set of reusable PHP components and a PHP framework for web projects.
Elgg is an award-winning social networking engine, delivering the building blocks that enable businesses, schools, universities and associations to create their own fully-featured social networks and applications.