SOPE is an extensive set of frameworks which form a complete Web
application server environment. Besides the Apple WebObjects
compatible appserver extended with Zope concepts, it contains a large
set of reusable classes: XML processing (SAX, DOM, XML-RPC),
MIME/IMAP4 processing, LDAP connectivity, RDBMS connectivity, and
iCalendar parsing.

WWW: http://sogo.nu/