Positech Games has released Gratuitous Space Battles (http://www.redmarblegames.com/gsb.html) for Mac OS X 10.4 and higher. The US$22.95 game requires a Mac with an Intel processor.
Here's how the game is described: "GSB is the ultimate space strategy game. It's a strategy/management/simulation game that does away with all the base building and delays and gets straight to the meat and potatoes of science-fiction games: The big space battles fought by huge spaceships with tons of laser beams and things going 'zap!', 'ka-boom!' and 'ka-pow!'.
"In GSB you put your ships together from modular components, arrange them into fleets, give your ships orders of engagement and then hope they emerge victorio| Read more »