MapNuke is an open-source procedural map generator made for Dominions 5. It is no longer being updated, but it is in a stable state and if you are playing a Dominions 5 game it is recommended to use this version for generating your map.
MapNuke 2 is the second iteration of the open-source procedural map generator, upgraded for Dominions 6. It is recommended to use this version for Dominions 6 map generation.