Below is some of the software I have written or hacked on.
KDaemonManager is a KDE systems settings module for managing daemons.
The primary focus is usability above anything else. This application has only been designed with Kubuntu in mind, though there's no reason it won't work with others.
This KIO slave lists files for an installed package. This makes it easy to find configuration files for a piece of software, find where space is being used or even simply to have a look at what is installed.
KWakeOnLan is a graphical front end for KDE for sending Wake On Lan packets to your computer. WOL packets cause a target computer to wake up. This appliation allows you to wake any computer from Mac address, and also to store that address for future waking.
Ipodslave is a project started by Michael Schulze for editing the contents of your iPod through the most natural way possible. The File browser. Songs can be viewed in the traditional Artists/Album/Song much like you would expect to find them in an organised system, even though they are stored in a far more obfuscated format on disk. (Stupid Apple). I have ported the project so that it runs under the latest QT4/KDE4 environment.
KDE Service Menu Editor is a simple way of editing the right-click menus that you see when using Dolphin. It has simple but flexible way of selecting the "mime types" (type of file) that the menu should appear on. Then adding the menu is as simple as typing a name and the command