The goal of the Jakarta Project is to provide commercial-quality server solutions based on the JavaPlatform that are developed in an open and cooperative fashion.
http://jakarta.apache.org/
The JakartaProject consists of a number of subprojects.
ApacheTomcat is the reference implementation of the Servlet API that started the whole project, which was donated to Apache by Sun.
JakartaAnt started as a subproject as well, but has now become a project of its own right (ApacheAnt).