Steel Storm is described by its developers as an "indie top-down archade shooter" with single-player, death-match, and co-op game modes. The game is being simultaneously released for Linux, Mac OS X, and Windows operating systems.
This game is described as fast-paced, streamlined, online warfare up to sixteen players, 25 different campaign missions, and new missions can also be created. Below is the trailer for this game.
See more information on the Steel Storm web-site.