BlueLava is a Web and WAP (CGI-based) x10 interface. Using commandline-based x10 tools as its backend, it allows you to control x10-compliant electronics and x10 modules from within a Web browser or a WAP/WML-enabled device. Uses of BlueLava include the remote control of lamps, appliances, and other electronics via the Internet.
jukebox-control includes a Linux driver module for an easy/dirty cheap to build DIY parallel to the Sony S-Link interface, plus Perl modules with both control-A1 (II) and control-S protocol implementations. Its actually-incomplete development state makes it interesting for developers mostly.
printerpowerd is a little Python script designed for users of older printers who want to save power when not using their printer, without manually turning it on and off. It runs, checking the printer queue directory every five seconds, turns it on when it sees a job, and turns it off after a configurable amount of idle time.
XMLTV is a set of programs to obtain and process TV (tvguide) listings and manage your TV viewing. It stores the listings in an XML-based format and most of the programs are filters which read and/or write XML. It includes tools to obtain, sort, grep, print, and munge listings, and two end-user programs to plan a week's TV viewing.
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.
PAUS is a system for controlling stuff with simple event-based Perl scripts. It can be used for controlling your house, creating an alert system, or making a remote controlled mp3 player. It is a flexible project that "merges" other I/O projects together, such as lirc (remote control), lcdproc (LCD output), mpg123 (mp3 player), and various I/O boards (such as the K8000). It's modular, extensible, multi-threaded, and has networking support.
J/CoMM is an OS independent RS232 remote control. The system has a client/server architecture, has an adjustable HTML GUI, and includes drivers for cameras and beamers (e.g., EIKI LC-XM1/SM1/VM1). The server runs on the computer where the devices are connected via RS232. The client can be any computer having a Web browser, JRE, and access to the device control Web site on the server. The Web page (GUI) communicates with the server through an embedded Java applet (RMI).