SCAr (Seam Client for Alfresco rivet) is a production-ready demo application for accessing an Alfresco document management repository.
SCAr is built with JBoss Richfaces, JBoss Seam and RAAr.
For more background, read Alaaeldin El-Nattar's blog post (he's the project lead) introducing SCAr - A Rich Java UI for Alfresco.
A demo site can be accessed at http://scar.rivetlogic.com.
SCAr is licensed under the GNU Affero General Public License.