Please pardon the somewhat spammy post but a Cadence employee suggested that I announce the DesignTools project here.
The DesignTools project contains open source EDA, CAD and CAM tools. The first initial release contains two programs along with their supporting libraries and utilities, all of which are specific to Cadence PCB Editor (Allegro).
Like any open source project, as time and resources allow, more programs and libraries will be added.
JCR...thanks for offering these tools to the community. I have downloaded and installed these already and they look very promising from the get go!