I dunno if you consider a non-combat application a 'game' or not, but there's a pretty nice, totally FREE space-flight simulator to be had at
www.orbitersim.com (this automatically forwards you to the more complex 'real' URL). It's been in development for years, with constant updates and improvements just like SE IV. The system requirements are remarkably low for a real-time simulation, too. Any computer assembled in the Last 5 years ought to be able to run it. If you have a high-end video card there are some special (very large) textures you can download to enhance it.
[ March 14, 2003, 17:47: Message edited by: Baron Munchausen ]