zenbook Nov 12, 2009 / Updated: Jul 07, 2014
Zenbook is a simple Facebook application that helps you to integrate your Zenphoto gallery with Facebook. It acts a kind of proxy between the Facebook platform and Zenphoto servers. Zenbook's source is provided under a modified GPL licence and free to anyone to use and modify. (Note: The developer has canceled further developement).
Also see the corresponding forum thread for more information: https://www.zenphoto.org/support/topic.php?id=1969
This extension is hosted and (hopefully maintnained) by its author.