ifplugd is a daemon which will automatically configure your ethernet device when a cable is plugged in and automatically de-configure it if the cable is pulled out. This is useful on laptops with onboard network adapters, since it will only configure the interface when a cable is really connected. Features include:

mozplugger allows you to seamlessly integrate external applications to view files downloaded from the web that Mozilla can not normally handle. The application is embedded within a Mozilla window as to act like and feel like a true plugin.

Email::Outlook::Message reads e-mail messages stored as .msg files (such as generated by Microsoft Outlook), and converts them to Email::MIME objects.

The open source Calendar and Contacts Server project is a standards-compliant server implementing the CalDAV and CardDAV protocols. It provides a shared location on the network allowing multiple users to store and edit calendaring and contact information.