The IBM® WebSphere® Application Server Community Edition is a Java™ Platform, Enterprise Edition 6 (Java EE 6) server that is based on Apache Geronimo v3.0 and complies with the Java EE 6 Full Profile specification (JSR 244). Unlike other Java EE servers, it is running on an OSGi framework, which means it supports both OSGi bundles and Java EE applications. The Community Edition server provides a platform for multi-tier enterprise applications, including support for:

Java EE programming model
• Java Servlet 3.0 (JSR 315)
• JavaServer Faces (JSF) 2.0 (JSR 314)
• JavaServer Pages (JSPs) 2.2 (JSR 245)
• JavaServer Pages Debug 1.0 (JSR 45)
• JavaServer Pages Standard Tag Library (JSTL) 1.2 (JSR 52)
• Dependency Injection for Java (DI) 1.0 (JSR 330)
• Contexts and Dependency Injection (CDI) 1.0 (JSR 330)
• Common Annotations for the Java Platform 1.0 (JSR 250)
• Enterprise JavaBeans (EJBs) 3.1 (JSR 318)
• Expression Language(EL) 2.2 (JSR 330)
• Java EE Connector Architecture (JCA) 1.6 (JSR 322)
• Java Persistence API(JPA) 2.0 (JSR 317)
• Java Transaction API (JTA) 1.1 (JSR 907)
• Java Message Service (JMS) 1.1 (JSR 330)
• J2EE Application Deployment 1.2 (JSR 88)
• J2EE Management Model 1.1 (JSR 77)
• Java Authorization Contract for Containers 1.3 (JSR 115)
• Bean Validation (JSR 303)
• Web Beans (JSR 299)
• Java API for Restful Web Services 1.1 (JSR 311)
• Java API for XML-Based Web Services (JAX-WS) 2.0 (JSR 224)
• Java API for XML-based RPC (JAX-RPC) 1.1(JSR 101)
• Java Architecture of XML Binding (JAXB) 2.0 (JSR 222)
• SOAP with Attachements API for Java (SAAJ) 1.3 (JSR 330)
OSGi enterprise programming model
• Web Application Bundle(WAB)
• Enterprise Bundle Archive(EBA)
• Composite Bundle Archive(CBA)

Thanks for using WebSphere CE!