You can find the full source code for this website in the Seam package in the directory /examples/wiki. It is licensed under the LGPL.
Seam provides a number of JSF components to support the use of Seam with JSF such as integration between JPA and drop down lists and conversation control.
We deprecated the date picker because it was taking a lot of time to maintain, time which was better spent on developing the core of Seam. There was no way the Seam date picker could be better than that in dedicated JSF component sets.