Astrosiege
Astrosiege puts you in control of your own powerful space craft to blast your way through the alien hoards in this classic fast paced arcade shoot-em-up. Destroy dozens of unique 3D accelerated alien fighters and upgrade your weapons with rocket and laser powerups. ... Astrosiege combines popular space shooting action with 3D accelerated graphics and incredible particle effects. ... The free version includes 3 intense campaign levels and the dynamic Marathon mode in 4 different modes of difficulty.
http://www.plowsoft.com/AstrosiegeDemoSetup.exe - 2Mb - Download - Screenshot

Star Ball
At the edge of the galaxy, deep within asteroid rings, an ancient culture stashed away a powerful artifact known as Star Ball. They protected Star Ball with a belt of impervious bricks. After many millennia, people are in dire need of the ancient knowledge. ... As a space fighter pilot you are charged with the task of acquiring Star Ball. ... Get to the pilot wheel and get that artifact at any cost! ... Download Full Version for Free! ... On your way to Star Ball, you will encounter various power-ups, such as laser guns, missiles, plasma ball, cryo ball, and many others.
http://www.justfreegames.com/downloads/games/starball/us/StarBall.exe - 2Mb - Download - Screenshot

Galactix
Pilot your way through the relentless Xidus Fleet in an attempt to save the earth from annihilation. Galactix is a space arcade type game where you pilot your ship to shoot enemy fighters and collect bonus's with your ships mechanical arm.
http://www.mking.com/download/galactix/galactixshr.exe - 3Mb - Download - Screenshot

Power Manga
Power Manga, developed by TLK Games, belongs already to the legacy of the space adventure. It is one of the best Arcade Game developed under GNU General Public License. The present version for Windows is as neat as exciting. 42 levels, more than 200 sprites, some 14 guards that you must destroy... After a peace treaty about free interplanetary circulation that was concluded 150 years ago, the whole space has been turned into a giant floating trash. ... Meteorites deviated from their trajectories and with wild pirates, each of them representing a deadly danger for the peaceful navigators...
http://www.tlkgames.com/share/power_manga_share.exe - 7Mb - Download - Screenshot

Jack of All Trades
Explore the galaxy in search of fame and fortune in this exciting new space adventure game. Become a trader, bounty hunter, rebel, stock market guru, or even a deadly space pirate. Buy from a large selection of ships including freighters, fighters, and capital destroyers. ... Once you have earned enough cash you will likely want to set your sights on something grander: saving the galaxy itself. ... The various governments and guilds are at war with one another. ... Something needs to be done. ... Are you up to it Captain?
http://www.dingogames.com/jack/jackdemosetup.exe - 2Mb - Download - Screenshot

Jack of All Trades (for Mac)
Explore the galaxy in search of fame and fortune in this exciting new space adventure game. Become a trader, bounty hunter, rebel, stock market guru, or even a deadly space pirate. Buy from a large selection of ships including freighters, fighters, and capital destroyers. ... Once you have earned enough cash you will likely want to set your sights on something grander: saving the galaxy itself. ... The various governments and guilds are at war with one another. ... Something needs to be done. ... Are you up to it Captain?
http://www.dingogames.com/jack/jackofalltradesdemo.dmg - 4Mb - 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

Star Wraith IV: Reviction
You have been assigned to this new special operations wing, an elite group of the best fighter pilots in known space who have been given the responsibility of flying covert assignments deep inside enemy territory. Your duties will include recon, capture, patrol, escort, and much more. ... You'll have no support and may also be called upon to mine for resources and explore as you venture into hostile space. ... Skill and combat knowledge means survival in this 3D starfighter simulation that takes space combat to the ultimate level.
http://www.starwraith.com/sw4_install.exe - 10b - Download - Screenshot

Atomaders
This space-shooter is based upon the classical Invaders/Galaxian idea. You have to liberate your planet system from the alien invasion using your spacefighter. Player can obtain various extra-weapons and special abilities by destroying enemy cyborgs, fighters and motherships. ... Additional planet systems could be downloaded from the Internet. ... Each planet has its own cyborg types and an unique powerful boss at the last level.
http://kraisoft.com/files/atomadersdemo.exe - 9Mb - Download - Screenshot

Redisruption
The Elefun Company presents a new game named REDISRUPTION! Redisruption is a classical space scroller. The central defense computer of a stellar system, belonging to the Earth Federation, got captured by unknown villains. The criminals seized almost the entire defense system. ... Open space is not the only arena for the fierce battles. ... But the enemies are well-armed too, so they won't give up easily. ... Your armament system is upgradable, and special bonus weapons increase fire power vastly.
http://download.elefun-desktops.com/ga_Redisruption.exe - 6Mb - Download - Screenshot