PloneMailList is a Plone product (V1.1 pour Plone2.5 et V2 pour Plone3) able to manage standard mailing lists over Pop or Imap Protocol. Messages are stored as Plone contents and can be browsed and searched through the Plone interface.
Fle3 is a web-based learning environment written in python for Zope. This Sourceforge project is inactive at the moment - click the Homepage link to go where the action's at.
Library of Plone Products (version 2.5 and later).