Games like Deuterium Wars on Steam
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FPS Game: Dev Test
A Simple, Fun, Multiplayer FPS game, strictly built and packaged for development testing and networking development.
RuneScape ®
RuneScape is a high fantasy open world MMORPG. Explore an ever changing and evolving living world where new challenges, skills, and quests await. Featuring unprecedented player freedom, you choose how to play, adventure, and grow.
Countersnipe
Multiplayer Seek and Snipe
SYNTHETIK: Arena
Face the varied challenges of the Machine God Zir in ARENA, a standalone expansion for Synthetik: Legion Rising! Leverage the next level in gun-play and experiment with powerful tech in varied action packed Arenas!
Battle Grounds III
After 6 years of development, Battle Grounds III (BG3) is the next iteration in the classic franchise which began 17 years ago. Prepare for battle in the American War of Independence!
WARMODE
Free to play shooter about the confrontation of two irreconcilable sides, represented by the government military housings and the armed hirelings. Try your hand at virtual battles with off-scale dynamics and hurricane gameplay in the spirit of the classical shooters.
Shakes and Fidget
Shakes & Fidget is a hilarious fantasy role-playing satire and at the same time, an award-winning RPG! Sounds crazy? With over 50 million enthusiastic players, it ranks among the most celebrated online role-playing games worldwide!
War Brokers
War Brokers is a fast paced, first person, 3D shooter focused on fun and tactical choices. Players start on an equal footing with access to all weapons and vehicles. A player's skill and tactical choices will win the day.
The Lord of the Rings Online™
Join the world’s greatest fellowship of players in the award-winning online re-creation of J. R. R. Tolkien’s legendary Middle-earth.
Summoners War: Chronicles
The King of Rahil is looking for a Summoner to protect the kingdom against Tefo's enormous conspiracy. Explore a vast world with your Monsters by your side in this new Action RPG set in the Summoners War Universe.
Death Toll
Death Toll is a multiplayer, open world first person survival shooter with a unique game mode that focuses on team play. Players are dropped into the world with nothing but their cunning, their will to survive, and the game's single goal: Escape the Island.
Dystopia
Dystopia is a cyberpunk game with tense combat situations in a high-tech world spanned by computer networks. Playing as either Punk mercenaries, or Corporate security forces, the player will fight through the physical world to gain access, via jack-in terminals, to cyberspace.
FOS
In this game, you can do whatever you want, not necessarily follow the story of the game, you're not some dirty farmer, right? And for whom did this pathetic, boring, and generally unbearable story come up, because you don't always have to follow it right?
Ironsight
Online FPS game, near future background, Resource Warfare between Military Forces and PMC. More than 50 kinds of original weapons with customization option. Use Peripheral objects, Tactical drones, Active objects to experience dynamic warfare.
Spellsworn
Enter a world of magic and battle, where your wits and reflexes will be pushed to their limits! Choose your spells, enter the ever-changing arena and prepare to obliterate all who stand in your way!
Einar
The player takes on the role of Einar, who is on a quest to kill the inhabitants of a Norse fishing village who are infected by a mysterious material. Use different weapons such as the bow, hammer and axe to clear the village of the monsters.
Nova-Life: Amboise
Nova-Life: Amboise is a multiplayer role-play simulation video game. Create your character and start your second life!
Omegalodon
Omegalodon is a third-person multiplayer action game where players compete by attacking/defending the city. The Red Team is comprised of police and soldiers armed with an array of military vehicles and explosive weaponry. The Green Team is comprised of Omegalodon, a 100-foot shark monster, and the Enviros, equipped with a healing beam.
GunZ 2: The Second Duel
GunZ 2: the Second Duel is a free-to-play 3D TPS and is the most fast-paced tough action shooter game.
Star Trek Online
In Star Trek Online, the Star Trek universe appears for the first time on a truly massive scale. Players take the captain's chair as they command their own starship and crew. Explore strange new worlds, seek out new life and new civilizations, and boldly go where no one has gone before.
Century: Age of Ashes
Century: Age of Ashes is a free-to-play multiplayer dragon shooter. Master a growing roster of classes and dragons, compete in intense arena battles and rule the skies in fast-paced aerial combats.
Warplanes: WW1 Sky Aces
Be a pioneer of aerial warfare in Warplanes: WW1 Sky Aces. Fight above the battlefields of World War I and become the ultimate Sky Ace!
BLEACH Brave Souls
The world of mega-hit manga and anime BLEACH comes to Steam in this exciting 3D action game! Build a team using your favorite characters from the BLEACH universe!
CityBattle | Virtual Earth
CityBattle - Thousands of cities fighting for dominance. Join the army of your Virtual City in the MMO F2P shooter using Unreal Engine 4.
Fantasy Tales Online
Fantasy Tales Online is a retro MMORPG where you must form parties, collect gear, fight through dungeons and defeat bosses. Featuring puzzles, a rich item system and complex encounters. This isn’t your run-of-the-mill grindfest MMO title!
Sword Art Online: Integral Factor
Aim to conquer Aincrad with Kirito and Asuna
Dungeons & Dragons Online®
Enter a world of danger and adventure with Dungeons & Dragons Online® based on the beloved RPG that started it all.
Alien Swarm
Co-operative multiplayer game and complete code base available for free.