The NET-SNMP (formerly UCD-SNMP) package contains various tools relating to the Simple Network Management Protocol including an extensible agent, an SNMP library, tools to request or set information from SNMP agents, tools to generate and handle SNMP traps, a version of the unix 'netstat' command using SNMP and a Tk/perl mib browser. It was originally based on the Carnegie Mellon University SNMP implementation (version 18.104.22.168), but has been greatly enhanced, ported and fixed and barely resembles the original package anymore.
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.
ShoStats is a reimplementation of phpSysInfo in Perl, useful for running from crontab and outputting the stats to a PHP include file, which can then be displayed on a hosting account. It is modular and configurable, including modules to support both Linux, OpenBSD, and NetBSD, an output module for PHP include files, and transfer modules for output to stdout (which can be redirected or piped) and uploading to an FTP server.