Did they add any bigger maps now? I always enjoyed playing on huge maps with small player count, so there was enough resources and huge bases... Wasn't possible last time I tried 0 A.D., since it forced the number of players depending on the map size, and the maps were 4 players max as well.
If it's open source, it is necessarily free, just saying.
0 A.D. is free of charge and always will be.