Wolfire Games has announced the release of 0 A.D. Alpha 6 Fortuna, as their latest development version of this ancient warfare game that's long been in development. This latest open-source update has lots of terrain texture updates and other new game assets for your summer fighting pleasure.
Among the official changes in 0 A.D. Alpha 6 are several new unit stances, 250 new terrain textures, 43 new sound effects, new artwork, new and updated maps, a P-51 flight demo map, and several other enhancements.
More details can be learned from this forum posting
along with the download links for this multi-platform open-source game.