DBIx::AnyDBD is a Perl module for developers writing cross database applications. It allows you to write "plugins" for different DBD drivers (Oracle, Sybase, etc) so that your application can do different things on different databases. It doesn't provide any compatibility layer - just an intelligent method to switch to the right class to use at runtime.
DBIx::Password provides an abstraction layer for password maintenance. It is database independent and only overrides the connect method (so it basically behaves as DBI normally does). You provide a single virtual user name in the connect method and the module determines which database/which user/which password to provide.
ePerl interprets an ASCII file bristled with Perl 5 program statements by evaluating the Perl 5 code while passing through the plain ASCII data. It can operate in various ways: As a stand-alone Unix filter or integrated Perl 5 module for general file generation tasks and as a powerful Webserver scripting language for dynamic HTML page programming.
Finance::Quote is a Perl module which can fetch on-line stock quotes, including those from American, European, Canadian and Australian markets. Information from a number of investment houses is also available. Features include currency lookups and conversions, automatic failover support, and loadable user modules.
FormMagick is a set of Perl modules intended to ease the task of writing multi-page Web forms. It takes a description of the form (fields, validation to perform on each field, etc) in XML format and generates HTML on the fly. Other features include templates for changing the "look and feel" of your forms, and the ability to easily localise your text for other languages.
Geo::METAR is a Perl module for parsing METAR data (aviation weather reports). You can retrieve weather data from airports around the world. and get the current temperature, cloud coverage, and so on. Included in the distribution is a sample Perl script that uses LWP to fetch current data from the airport of your choice and spits out the current temperature.