pu6e is an editor for Ultima 6 and the Worlds of Ultima games (Martian Dreams, Savage Empire). It lets you manipulate many aspects of the game world and play the results with the original games.
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.