AstroRaid
   Arcade style vertical shooter set in space. Battle through alien forces to deliver a vaccine to earth and save the human race.
   http://www.gamerange.com/astroraid.html

IronHero
   3D tank shooter. System requirements, screen shots, and news.
   http://www.ironhero.com

Planetary Defense
   Arcade-style planetary defense game. Its features include its small footprint, multiple difficulty levels, and several weapon types. Available for Windows in several languages.
   http://www.positech.co.uk/planetarydefence/index.shtml

PoMPoM Games
   Free demo and purchase of Mutant Storm and Space Tripper for PC, Mac, and Linux.
   http://www.pompom.org.uk/

RedEagle
   First/Third person futuristic game featuring single- and multiplayer modes. Requires a PowerPC running Macintosh Classic (Systems 8 and 9, or OSX in Classic mode.)
   http://tyzoft.com/RedEaglePage.html

Space Invaders for DirectX
   Clone of the classic arcade game Space Invaders.
   http://www.btinternet.com/~jason.brooks/Software/SpaceInvaders/index.html

Warheads SE
   Contains a forum, downloads, pictures, and help.
   http://www.warheads.net/