citygen is a program which creates Medieval city and kingdom demographics. The demographics are completely configurable with options to force certain professions and to limit specific buildings. It's very handy for AD&D and other RPGs.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.