Apache Tomcat

Apache Tomcat powers numerous large-scale, mission-critical web applications across a diverse range of industries and organizations. Apache Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages technologies.

http://tomcat.apache.org/

IBM® WebSphere®

WebSphere Application Server is the foundation of the IBM® WebSphere® software platform which delivers the secure, scalable, resilient application infrastructure you need for a Service Oriented Architecture (SOA).

http://www.springframework.org/

JBoss

The JBoss Application Server is a J2EE certified platform for developing and deploying enterprise Java applications, Web applications, and Portals. The JBoss Application Server provides the full range of J2EE 1.4 features as well as extended enterprise services including clustering, caching, and persistence.

http://www.jboss.com

BEA Weblogic

BEA WebLogic Server® 9.2 is the rock solid foundation for enterprise applications and SOA services. As the world's leading Java-based application server, BEA WebLogic Server includes zero downtime features for enterprise-class reliability and uptime.

http://ws.apache.org/axis/