Yass is a Web-based streaming server with an iTunes-like interface. It shares your MP3 library and allow access to your tracks through the Internet. The server side is in Java, and is Java servlet specification compliant (you may install it on Tomcat, Jetty, etc.). It uses JPA for data access (openJpa), Spring transactions, JAX-RS and JAXB (Jersey) for client-server communications, and Apache Derby for data storage. The client side is build on Adobe Flex and ActionScript.