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.
You can download nightly snapshots of Weld from the oss.sonatype.org Maven repository.
The Weld project consists of many Maven artifacts. The following diagram displays the hierarchy of the various artifacts within the Weld SVN repository (click to open the full size image in a new window):