Apache Geronimo: The J2EE server project of the Apache Software Foundation.
Apache JServ Project: Java servlet module for Apache web servers compliant with the Sun Java Servlet APIs 2.0 specification. [Open Source, BSD-like]
Geronimo Live: Weblog by McQueeney, Tom with Apache Geronimo news.
The Jakarta Project: An Apache working group dedicated to providing a high quality, world class 100% Java Servlet and JavaServer Pages implementation. Involves ex-members of the old Apache Jserv Project and engineers from Sun, IBM, and other major corporations. Stable releases are now available. [Open Source, BSD-like]
Tomcat: The Apache developer community, Sun, IBM and others are working together to produce the official reference implementation for the Java Servlet 2.2 and JavaServer Pages 1.1 Technologies. [Open Source, BSD-like]
Tomcat Basics: Tutorial help develop Web applications with the Tomcat engine.
Tomcat User Mailing List: Includes subscription information and searchable web archive of the Tomcat User mailing list.