Or, use Andreas König's CPAN module to retrieve, build, and install any of the CPAN modules automatically. It's useful for upgrading current modules as well as installing new ones.
A not-so-new module by Nick Ing-Simmons that implements the Unix make command in Perl. It can be used to parse Makefiles.
The NNML::Server module, by Ulrich Pfeifer, implements a minimal NNTP (a.k.a. Usenet or Netnews) server.
Sampo Kellomaki's Net::SSLeay module provides a Perl interface to Eric Young's implementation of the Secure Socket Layer.
PDL is the Perl Data Language, an extension for compact storage and speedy manipulation of large N-dimensional data sets such as images or movies. It's in late alpha, and development (mostly by Karl Glazebrook and Tuomas Lukka) is ongoing. Subscribe to perldl-request@jach.hawaii.edu for more information.
Steve Lidie's Tie::Watch module lets you place a "watchpoint" on any Perl variable. The watchpoint is a subroutine invoked whenever the variable is accessed.
The Virtual Reality Modeling Language is like HTML, but describes scenes instead of documents. When you visit a URL containing a VRML world, a file is downloaded to your computer. A VRML-enabled browser then interprets the file as a geometric description of a VRML world, letting you interact with it in real time. There's VRML 1.0 and VRML 2.0; Hartmut Palm's module provides Perl methods for both.
A collection of Perl modules that know how to talk to certain WWW search engines: AltaVista, Lycos, and HotBot. WWW::Search requires LWP, which you should already have if you're a serious Web hacker. If not, see the next page!
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If your module is of general interest to Perl programmers and is on the CPAN, let me know! Send a brief description to submissions@tpj.com for inclusion in this column.