ADJE WebMail is a set of Perl CGI scripts which provide a Web interface to existing email accounts on any POP3-compliant email server. The software provides a complete interface, including encoding/decoding attachments, email and URL markup in received emails, and an address book for each user.
The Amahi Home Server is a Linux home server based on Fedora (and later on Ubuntu). Your machine becomes a "Home Digital Assistant" (HDA) after the installation. It provides a growing set of community packaged apps like an iTunes server, UPnP server, calendar server, a wiki, shared network storage, network backups, a printer server, VPN, and a plug-in architecture built on Ruby on Rails.
Birch is a package of Perl scripts that runs a photo blog. It displays and archives photos with captions, and has an easy to use administrator interface that allows you to upload new photos and change the captions on old ones. It uses an XML file to store the photo information, so no database is needed. The installation page automates setup for you.
Bricolage greatly simplifies the complex tasks of creating, managing, and publishing vast libraries of content. With advanced features such as fully-configurable workflows, customizable document types, and comprehensive Perl and PHP templating support, it has been designed from the ground up to scale to meet the demanding needs of large organizations around the world.
CGI:IRC is a Perl/CGI program that allows you to use IRC from a Web browser without having to have access to an IRC port. It does not use Java, but it does need a browser capable of rendering frames. It can be used on a Web page to allow users to chat, or it can be used to access chat from behind a firewall.