I have 2 open source projects, and both rely heavily on the Gang Of 4 design patterns. The projects are probably more "object oriented" than most though still far from perfect. One of the issues is that some of the code in the projects is 4 or 5 years old and I have learned more within that period.
The current version of jamon also has some interesting techniques using reflection, weakhashmaps, localization, and
thread safety code
The links are below and the code is available at sourceforge.
For a live demo of JAMon go to
JAMon Live Demo [ July 13, 2006: Message edited by: steve souza ]