Tomcat is the servlet container that is used in the official Reference
Implementation for the Java Servlet and JavaServer Pages technologies.
The Java Servlet and JavaServer Pages specifications are developed by
Sun under the Java Community Process.

Tomcat is developed in an open and participatory environment and
released under the Apache Software License version 2.0. Tomcat is
intended to be a collaboration of the best-of-breed developers from
around the world.