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http://today.java.net/images/tiles/111-appfuse.gif
Raible Designs' AppFuse runs best on Tomcat. They wrote an interesting post comparing standards-compliance and performance on Tomcat and other containers.
Bonhams
http://www.bonhams.com/images/BonLogoGrey.jpg
Bonhams is an auction house founded in 1793, running Tomcat and other open-source software, as detailed in this article from CIO Magazine.
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