Tomcat is the reference implementation of the J2EE Servlet Specification. It is also an Enterprise strength solution that can be integrated with a variety of other components (Apache/mod_jk, AJP stack, Jasper, etc..) to deliver complete web-tier functionality.
Tomcat is hosted by Apache's Jakarta Project.
License: Apache Software License
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Servlet 2.4 Specification Review Greg Wilkins
Tomcat Project Page Jakarta Project

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