Netrek
Netrek is a free multiplayer online space battle game. Team up to battle with and against people around the world. As a player, you captain different starships to bomb armies, engage enemy ships and invade planets in order to expand your team's space empire and conquer the universe. ... Think again, since you are always teaming up with different people as well as playing against different people, there is always a challenge. ... The ultimate goal being to wipeout the enemy race by battling your enemy with the spacecraft of you choice.
http://www.playnetrek.org/netrek/netrekinstall.exe - 2Mb - Download - Screenshot

Robot Invasion
Blow away ruthless robot invaders by the hundreds in this fast paced 3rd person 3D shooter. You'll be battling robots in diverse and awesome environments, while trying to save as many humans as possible. Some of the places you'll do battle are a spooky castle, ghastly grave yard, a space station... You'll battle a large variety of robots that become ever more ruthless as you progress through the game. ... Pure adredaline filled action awaits anyone who takes on the mission to save humanity in this fast paced action arcade game.
http://www.best3dgames.net/roboinv/roboinvd.zip - 13Mb - Download - Screenshot

Galaxy Guard
Your Galaxy is attacked by alien invaders. Your warship was entrusted with an important mission. Infiltrate into the enemy space forces and destroy all command ships that control the military operations. A lot of enemy space fighters and battle planes will stand in your way trying to prevent... Sometimes you come across big command ships that are the primary aim of your battle mission. ... Good luck in your battle mission! ... Fly over a certain battle area at each level. ... Get the chance to equip your ship with new weapon, armor and energy by destroying the enemy ships.
http://www.enjoyfreegames.com/files/galaxygsetup.exe - 2Mb - Download - Screenshot

Last Man Standing
Mankind is locked in a battle for survival against the machines. The powerful and ruthless war computer Skullnet has turned on its creators, humans. Skullnet is now threatening to eliminate entire mankind. You, an ace solider, are mankind's sole hope. ... As a pilot of the highly advanced tank Ajay, your job is to battle and destroy Skullnet's mighty armies, and finally, destroy Skullnet itself! ... Last Man Standing marries feverish tank battles of BattleCity to twitch gameplay of space shooters.
http://www.ironcode.com/data/Last Man Standing Demo Setup.exe - 3Mb - Download - Screenshot

Zirconia 2: Battle
Zirconia 2: Battle is a unique 2D "space" shooter not set entirely in space. In this game, you and a computer-controlled opponent are playing vertical scrolling shooters, split-screen style. You must defeat 7 different opponents indirectly by using cards that you will draw throughout the course... Finally, choose an opponent to battle and start the match. ... When you defeat an opponent, you will receive upgrade points for permanently improving the stats of your choice. ... 5 cards will then added to your deck automatically, and you can choose 5 more cards from a reward card pool.
http://www.z2games.com/zirc2battleInstaller.exe - 16Mb - Download - Screenshot

FurtherTime
FurtherTime is a space combat simulator. Action takes place in the close proximity of Earth. Fly your space fighter and fight against enemy wings of fighters, bombers, and interceptors. There are also heavy ships in the battle. Extremely realistic 3D models and breathtaking dynamics are the most... All the breathtaking action in this visually realistic 3D world with incredible detailed star fighters, bombers, interceptors, mid-size frigates with landing sites and huge cruisers with true 3D hangars immerses player in a really exciting environment of space combat.
http://www.furthertime.com/download/v11/FurtherTime11.zip - 6Mb - Download - Screenshot

Space Guards
3D spaceshooter with 3 missions. You just finished the space academy and are ready to join the Space Guards, an union for protecting scientific research of the cosmos. The first task is to protect the spacestation X5, which is directed by the brilliant young scientist Dr. ... Finally the battle on Mars. ... But it seems that they want to stop mankind from exploring the space. ... The enemy attacks with tanks and later with airborne crafts too. ... It becomes clear that mankind is at war. ... Under all circumstances an evacuation is to be avoided but how long can you remain?
http://mobileart.org/spaceguards/spaceDemoInstall.exe - 11Mb - Download - Screenshot

Galaxy Battles
Galaxy Battles presents a breathtaking variety of arcade space shooting. You get into the not-too-distant future. Numerous alien invaders attacked the Galaxy. You are the captain of a state-of-the-art spaceship. The spaceship is equipped with the newest devices and the most advanced weapons. ... Join your counterparts from all over the world and beat your best score! ... If your score is among the Top 10, you can upload it to our Web site and thousands of other players all over the world will be able to see your highscore!
http://www.myplaycity.com/files/galaxybatsetup.exe - 6Mb - Download - Screenshot

Star Defender II
Star Defender II is a Space Shooter Arcade. It is developed like an advanced clone of old classic Galaga and possesses all the best features of this genre. Again in this fabulous Shoot'em up game you will get a chance to destroy enormous armies of the cruel invaders and to save the Galaxy! ... Every new mission has different background witch puts you into the atmosphere of the real Space Battle. ... Your small but manoeuvrable space ship is controlled by your mouse. ... And you can enjoy all of this for hours being along or together with your friends and family.
http://www.awem.com/download/StarDefender2Setup.exe - 8Mb - Download - Screenshot

Beam Screensaver
Beam Screensaver - is OpenGL-accelerated 3D screensaver for Windows 9x/ME/NT4/2000/XP. Dive into fantastic world of furious space battles. You will be amazed how absorbing and relaxing this OpenGL-accelerated screensaver is. Discover yourself in the middle of space action among asteroid belts... Enhance the impression from virtual journey with your favourite CD or MP3 music.
http://beamscreensaver.com/dl/beams173.zip - 2Mb - Download - Screenshot