The open-source Zope product is written and maintained largely by Zope Corporation, formerly known as Digital Creations. You can read more about Zope Corporation at www.zope.com.
The main community development site for Zope is www.zope.org. It is from this site that you can download the latest versions, participate in discussions, download Zope products, learn about Zope and become part of the developer community.
The Book of Zope, written by Beehive and published jointly by No Starch Press and Linux Journal Press, is an excellent introduction to Zope for programmers and users alike. A full review will appear in next month's Linux Journal.