Heads Up Development has recently started publishing it's code under our new open source initiative. You can check out our current status at GitHub and download / contribute to or just be inspired by our code.
We have currently opened the source to some java utilies which we find very useful, an IRC management library for interacting with members of chat rooms and, most significantly, our licensing code. That's right - a full license management java library that can handle verifying licenses and limiting / enabling features in your software.
Let us know if you find this useful. Also please feel free to fork the code and send us pull requests for your favourite enhancements.