This site features the game Classic Invaders.
For programmers check out the series of articles I wrote on setting up for game programming with SDL.
Classic Invaders for iPad, iPhone®, and iPod touch®
Classic Invaders, the first game release from The No Quarter Arcade was released on April 17, 2009.
This version of the game runs on Windows, Linux, and Mac OS X and is available as a free download. Choose your platform from the games page.
I recently got an email from the good people at Softpedia - the encyclopedia of free software downloads. They checked out Classic Invaders and gave it their stamp of approval for both the Windows and OS X versions.
I had never checked out the Softpedia site before, looks like they have some good content.