This server runtime integrates open source projects, including Tomcat, MyFaces, and OpenJPA, to produce Java/OSGi server runtimes. The most popular distribution is a Java EE 6 application server runtime.
“Apache Geronimo is a modular, compose-able, open source server runtime,” says Kevan Miller, chair of the Geronimo program management committee. “The next logical major release would be a Java EE 7 [version]. There haven't been any concrete discussions on a Java EE 7 release. We'll need to see more progress on the Java EE 7 specifications before that happens.” The project started in the Apache Incubator in 2003 and graduated as a Top Level Project the following year.