3D Space Gladiators
Are you tired of all these lame girlish screensavers with flowers, kitties and other cute junk? How about something dynamic and active? Like gladiators. 3D gladiators! 3D Space Gladiators!!! Get ready for an adrenaline rush - 3D space gladiators fighting with each other to survive. ... 3D Space Gladiators is a macho space shooter screensaver that delivers. ... It's one of the hidden perks - 3D space shooter comes with the screensaver as a minigame. ... You must be thinking, "Too bad I can't be a space gladiator myself.
http://www.deaddybear.com/files/3dspacegladiators.exe - 4Mb - Download - Screenshot

Space Alien Invaders
Free arcade style space shooter game for the PC.
http://www.freewareshareware.net/download/sai.exe - 1Mb - Download - Screenshot

Desperate space
Experience huge battles in a brand new breed of addictive, asteroids style space shooter. Desperate Space takes the genre to exciting new levels with its team based gameplay and focus on saving lost civilian ships. Unlike other shooters, this game will deliver non stop action, whilst still... Desperate Space is quite simply a stunning asteroids style game, that will keep you playing for weeks on end! ... See how good you really are! ... If all that isn't enough for you there is the chance to for you to compete with with players all around the world in our online highscore charts.
http://www.jaggedbladesoft.com/desperate/DesperateDemo.exe - 8Mb - Download - Screenshot

Asteroid ES
Arcade Style Space Shooter
http://members.gamedev.net/battleline/asteroid_es_0_80_01.exe - 4Mb - Download - Screenshot

ZZed
In this wickedly addictive space puzzler-shooter, you have the dubious honor of collecting and destroying space garbage. All space junk is "color-coded", and in order to destroy it, you have to get 3 or more pieces of garbage of the same color stuck together. ... Download Zzed right away! ... Already stocked up? ... Oh, and by the way, the music is cool and the graphics are excellent. ... Zzed is totally captivating, so get to your neighborhood supermarket and pile up your grocery cart.
http://arcade.reflexive.com/downloadgame.aspx?AID=259&CID=4205 - 7Mb - Download - Screenshot

Alien Outbreak
Are you ready for some serious action? AlienOutbreak is the most addictive space shooter in the entire solar system. And very well may be in all other galaxies as well (we? ll find out as soon as we make the first real contact with the aliens). The game sucks in immediately and does not let go... Another important distinction from other space shooters is that AlienOutbreak lets you move up or down, in addition to the sideways movements. ... shooters. ... kill them all? ... Game graphics is truly superb and done in the best traditions of ?
http://www.beegames.com/alienoutbreak.exe - 3Mb - Download - Screenshot

Clash N Slash
Enjoy non-stop action space shooter with extremely simple controls suitable for all ages! Clash'N Slash, a totally new and highly addictive arcade space shooter for players who want to enjoy a fresh exciting gameplay and bored with playing tons of indistinguishable shooter games. ... Loads of weapons, upgrades, enemies will hold you for a long time and innovative bonus triggering system will make your game experience colorful and fun. ... With superior firepower and enhanced spaceship capabilities that can be upgraded from time to time and ability to build structures on your homeplanet to...
http://www.enkord.com/download/clash_n_slash_111.exe - 5Mb - Download - Screenshot

Asteroid F
Asteroids collide and aliens attack out of no where firing indiscriminately in this free arcade style space shooter game for the PC.
http://www.freewareshareware.net/download/af.exe - 1Mb - Download - Screenshot

Space Skramble
Space Skramble is a unique space shooter based upon the 80's classic Scramble. Players must dodge or destroy enemy missiles shot from the ground. Players also face swarms of enemy saucers that make maneuvering difficult at best. In some levels you assaulted by a storm of fireballs, that are fast... Pilot error is the only (though formidable) enemy. ... Some levels sends the player into obnoxiously tight machine tunnels.
http://www.tccons.com/SpaceSkramble/Space_Skramble_Install.exe - 16Mb - Download - Screenshot

Alien Invaders Attack!
Free arcade style space shooter game for the PC.
http://www.sci-fi-game.com/download/aia.exe - 4Mb - Download - Screenshot