It's not mentioned on the website, but it seems GOG has silently added Alien Crossfire to SMAC :) So if you already own the game - download the new installer (2.0.0.19 as of this writing) and you now have SMAC and Alien Crossfire. It was a great buy even before, now it's a sin not to buy it :) The pinnacle of 4X gaming, and no matter it's age I personally still enjoy playing it every now and then. For just one more try... :)
