psx is a framework for developing dynamic websites in php. It is completly object-oriented programmed and modular designed. All classes in the psx library are independent useable because of dependency injection. psx has a focus on social technologies it provide classes to implement oauth, openid, opensocial, pubsubhubbub, atom, rss. It seperate strictly between code logic and design. The template-engine is based on pure PHP that means speed and flexibility. By the way psx is of course open source and available under the GPLv3 license. For more informations please visit the website at phpsx.org.