Date::Manip is a Perl module for handling Gregorian dates. Operations such as comparing two times, calculating a time a given amount of time from another, or parsing international times are all easily done. The library is oriented towards the type of operations people tend to think of rather than those operations used routinely by computers.
Device::ParallelPort is a Perl API that allows low level access to the parallel port of most computers. It does this by using a number of drivers, which can be customized and added to, including Linux (direct and parport), Win32, Script, Dummy, and more. It also contains a number of direct access devices including an example printer and a relay controller card.
DiaNa is a Perl framework designed to process a huge amount of data, performing from very easy to very complex tasks in a very efficient, spreadsheet-like, batch fashion. DiaNa also features an interactive Perl/Tk GUI, layered on the top of several batch shell-scripts. The DiaNa syntax is a very small and orthogonal superset of the underlying Perl syntax, which allows, for example, comfortable addressing of file tokens and profitable use of file formats throughout the data processing.
EWS-Client is a module that acts as a client to the Microsoft Exchange Web Services API. From it you can access calendar and contact entries in a nicely abstracted fashion. Query results are generally available in an iterator and convenience methods exist to access the properties of each entry.