What are different Open source EJB Servers ?

OpenEJB

A modular, configurable, and extendable EJB Container system that comes with servers for both Local and Remote access.

Resin

Resin open source provides JSP, Servlet, and EJB functionality

JFox

JFox is an open source, standards-compliant, J2EE based application server implemented in 100% Pure Java, It comes from China Enterprise Open Source Community.

JBoss

JBoss is advanced middleware with a full J2EE based personality that IT departments look for. But that is not all, the OEM and ISV community embraced JBoss as a highly flexible service oriented architecture on which to build their own products.

JOnAS

JOnAS is a full J2EE platform, developed within the ObjectWeb consortium (www.objectweb.org), currently in the process of passing the Sun J2EE 1.4 Certification.

Geronimo

Apache Geronimo is a new effort coordinated by the Apache Software Foundation to make a J2EE compatible container.

Panther Application server

Panther is a lightweight, modular Java application server, suitable for embedding in a web server, and intended as an alternative to the current standard of large-scale/monolithic application servers.

It provides basic stateless/stateful session beans, a distributed, cached jdbc service, and jython-based configuration.

EasyBeans

EasyBeans is an open-source lightweight EJB3 container implementation developed within the ObjectWeb consortium (www.objectweb.org).

It can be integrated within JOnAS and Tomcat.