Here are my contributions to the ZOPE-Community:
Abracadabra Object - pre-configured objects with only one click
Epoz - a Wysiwyg-cross-browser-Editor for Zope
MailBoxer - a mailinglist-manager for ZOPE
PHParser - a PHP-Parser for ZOPE
NMIMETools - a replacement for the MIMETools
StructuredDocument - a StructuredText-Product for ZOPE
OrderedObjectManager - order your folders
PropertyObject - create databases in a few minutes
PropertyFolder - the folderish friend of the PropertyObject
PloneTrashcan - delete objects via a trashcan
PloneKeywordManager - tidy up your keyword-list in Plone
How to create a PDF-Document on the fly?
http://www.zfl.uni-bielefeld.de/
http://www.sachunterricht-online.de/
http://www.lehrplaene.org/
http://www.dzug.org/