Apache Tomcat is an OpenSource JavaServerPages and JavaServlet container, maintained by the ApacheSoftwareFoundation. It grew from the ReferenceImplementation of the servlet standard, and was gifted to Apache by Sun. It was named such that it could easily suggest which animal O'Reilly should put on the cover of a book about it.
It was originally known as "Jakarta Tomcat", as it was part of the Apache Jakarta suite of Java code.
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