DharmaDoc automates most of the tedious work involved in setting up a local Web server that contains a Buddhist reference library. The program allows you to download and install documents, and generates a search engine index. Afterward, you can just type your Buddhist topic of interest into a Web browser and get a wealth of information.
KDE Mass Mailer allows you to send mass email messages with KDE and Kmail. It can access the KDE adressbook or it can import CVS files to acquire the destination addresses. It can also insert data from these sources into the email message (like "Dear %firstname%"). All messages will be sent with a valid "To:" field.
M3Tk generates M3U playlists from MP3 files and edits ID3 tags. It creates the playlists from the Genre, Album, Year, and Artist tags. It scans the computer to search for MP3 files and sort them into playlists. The editor can change (or include) information about the MP3s, and can open an MP3 player and send the playlist to it. You can manage the files names with the MP3 Renamer.
rt_x10 is a kernel module that provides a realtime driver for the X10 "two way power line interface" device (Model TW523). X10 is a protocol for sending signals over power lines. This is useful for relatively cheap components (motion sensors, light switches, etc) that make home automation feasible for the average consumer.