Different types of server

Apache Geronimo (Apache Software Foundation)

Glassfish Application Server (Oracle Corporation)

Caucho Resin Application Server

WebSphere Application Server and WebSphere Application Server Community Edition (IBM)

JBoss (Red Hat)

Jetty (Eclipse Foundation)

JRun (Adobe Systems)

Oracle OC4J (Oracle)

Orion Application Server (IronFlare AB)

WebLogic Server (Oracle)

SAP Netweaver AS (ABAP/Java) (SAP)

tc Server (SpringSource)

Sun GlassFish Enterprise Server (based on GlassFish Application Server) (Oracle Corporation)

Sybase Enterprise Application Server (Sybase Inc)