The Doxygen-autogenerated D-Collide API reference documentation is publicly accessible at http://d-collide.ematia.de/apidocs/.
We have a Trac at http://d-collide.ematia.de/trac/ including an internal (currently heavily used) bug-tracker/ticket-system, and a private Wiki (developer access only).
Bug reports are appreciated, please send any questions or issues to d-collide-users@lists.sourceforge.net.
Our SourceForge project page is located at http://sourceforge.net/projects/d-collide.