WebAPP is a community portal and content management system written in Perl. Included are features such as forums, links directory, downloads directory, articles, gallery, handheld format, xml feed, profiles, instant messaging, and more all the time.
Recon-Calc is a source code feature location tool based on the Software Reconnaissance technique. It allows you to name features of your system and then, based on coverage profiles gathered, you can find where they are implemented in the source code.