The eXtensible Catalog Organization is working to design and develop a set of open-source applications that will provide libraries with an alternative way to reveal their collections to library users.
Please visit our project website at http://www.extensiblecatalog.org for a more complete overview of the eXtensible Catalog project and the software we are creating. Additionally, there is an overall XC mailing list, not just for the Drupal Toolkit, but other toolkits and topics, available at http://groups.google.com/group/extensible-catalog.
The eXtensible Catalog (XC) Theme accompanies the Drupal Toolkit, which manages the content and functionality library websites in one easy package with Drupal. The theme is designed to be fully customizable and extensible, allowing library websites to use the default theme or extend a "sandbox" them by creating custom sub-themes.