Once upon the time, I was travelling over the Internet, and I found a city simulator under linux called FreeReign at SourceForge. But it isn't maintained any more. I decided to push the game up so I had a look at the FreeReign sources. However, its codes were not obvious to me, and in addition the game design didn't fit my programming style. Finally, I decided to write my own free 3D city simulator, based on the original ideas of the FreeReign project. Few months later, OpenCity was born.