Postlister is yet another PHP/SQL mailing list program. It features an unlimited number of lists, subscription confirmation, no browser time-out, different signature for each list, language files, and a password-protected browser-based administration area that allows you to create/delete/edit lists, find/add/delete subscribers, and preview/send mail to the list(s).
PowerChute plus is the official software from APC to interface with their various UPS utilities. This is a complete monitoring program. PowerChute gracefully shuts down Linux servers during extended power outages, receive power alerts immediately (including proactive battery replacement notification), quickly diagnose problems using power event and data logs, and monitor power through standard web browsers (using PowerChute Web Device Manager option).
Ppower, short for 'Penguin Power', is a piece of software for controlling x10 home automation equipment connected to the computer via a cm11a interface. It can be used to turn things on and off and lights dim and bright. In addition to controlling the x10 devices, it can receive commands sent to the x10 devices from other sources such as an x10 remote transceiver and execute commands on your system in response.
PPP Keepalive is a perl script intended to maintain a persistent dialup connection. When the script redials it can then send an email containing your dynamic IP address to an email account or ftp the address to a server. This way you can obtain the current IP address for your box remotely. This also introduces security issues, so use at your own risk.