Project website: http://geronimo.apache.org/
Project Information: Apache Geronimo is an open source application server developed by the Apache Software Foundation and distributed under the Apache license. Geronimo is currently compatible with the Java Enterprise Edition (Java EE) 5.0 specification.
Books on Apache Geronimo:
Project website: http://grok.zope.org/
Project Information: An agile web framework based on the Zope3 codebase.
Books on Grok: