PMilter implements Sendmail's "milter" mail filtering protocol in Perl, allowing scripts direct access to the SMTP transaction in progress, rather than filtering later. It can function as a drop-in replacement for Sendmail::Milter, though PMilter does not require threads or the "libmilter" API to be available.
Geo::CCF is a Perl module that parses Coded Cities Forecast data files from the U.S. National Weather Service. It can find the predicted weather for the next seven days, including predominant condition (sunny, rain, freezing drizzle, etc.), high and low temperature, and chance of precipitation. A very basic sample script that displays the current forecast for Boston is included.
Astro::Aladin is a an object-oriented interface into the resources provided by the CDS Aladin project. The Aladin Java application is driven in script mode using an anonymous pipe, while high level access to resources is provided by the module which disguises the mechanics of the data access.
CfgTie is a package of Perl modules and tools. These make it easier to configure and maintain Unix computers. The idea is that just about everything in your machines environment can be operable through a single consistent interface. This is a set of tools that make many of the various configuration subsystem in your machine appear to be Perl variables of some sort.