PSX is a framework for developing dynamic Web sites in PHP. The goal of PSX is to help you develop RESTful APIs serving Web standard formats like JSON, XML, Atom, and RSS. It has a focus on social technologies and provides classes to use and implement OAuth, OpenID, Opengraph, Opensocial, Opensearch, PubSubHubbub, Atom, and RSS.
Amun is a content management framework based on the PSX framework. The goal is to build a more federated and programmable Web. This is achieved by providing a RESTful API for managing and distributing the content in standard formats like JSON, XML, Atom, and RSS. It tries to support open standards like OAuth, OpenID, etc., and gives you the freedom to access the data of a Website in the way you like. It tries to enable easy communication from server to server, browser to server, and application to server.