Apache Tomcat is a web container developed at the Apache Software Foundation (ASF). Tomcat implements the servlet and the JavaServer Pages (JSP) specifications from Sun Microsystems, providing an environment for Java code to run in cooperation with a web server. It adds tools for configuration and management but can also be configured by editing configuration files that are normally XML-formatted. Tomcat includes its own internal HTTP server.Description continues at WikiPedia...
Using TomCat for Plex-XML
Some hints for using Tomcat as a runtime environment for Plex-XML: