OpenEJB is an open source, modular, configurable, and extendable EJB Container System and EJB Server.
EJB Server
OpenEJB comes with fast, lightweight EJB Servers for both Local and Remote access. That's right, deploy your EJBs into the container system, then just start the Remote EJB Server from the command line! Or, put OpenEJB in your class path and use it as an embedded library through the Local EJB Server.
EJB Container System
As a container system, OpenEJB works like a big plug-in for middleware servers like Web servers, CORBA servers, and application servers. By plugging in OpenEJB these servers obtain instant EJB compliance for hosting Enterprise JavaBeans!
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