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The Ur-Quan Masters is a science fiction adventure game. It lets you explore a huge galaxy in search of events, species, and star systems. You control a single starship and its attached mini-fleet of combat vessels and improve it until you can challenge the might of the Ur-Quan (the current bullies in this sector of the galaxy).
Angband is a computer dungeon exploration game based loosely on the books of J.R.R.Tolkien. You explore a deep dungeon, kill monsters, try to equip yourself with weapons and armor, and finally face Morgoth, The Dark Enemy.
Sauerbraten (a.k.a. Cube 2) is a free multiplayer/singleplayer first person shooter, built as a major redesign of the Cube FPS. Much like the original Cube, the aim of this game is not necessarily to produce the most features & eyecandy possible, but rather to allow map/geometry editing to be done dynamically in-game, to create fun gameplay and an elegant engine. The engine supporting the game is entirely original in code & design, and its code is Open Source (ZLIB license, read the docs for more on how you can use the engine).
Battle for Wesnoth is a turn-based strategy game with a fantasy theme. You must build up a great army, gradually turning raw recruits into hardened veterans. In later games, you can recall your toughest warriors and form a deadly host. Choose units from a large pool of specialists, and hand-pick a force with the right strengths to fight well on different terrains against all manner of opposition.
In Warzone 2100 you command the forces of "The Project" in a battle to rebuild the world after mankind has almost been destroyed by nuclear missiles. The game offers campaign, tutorial, multi-player, and single-player skirmish modes. An extensive tech tree with more than 400 different technologies, combined with a unit design system, allows for a wide variety of possible units and tactics.
Nexuiz is a first-person shooter game. The gameplay is deathmatch, with the most excessive possible speeds and weapons, giving incredibly intense fast-paced action. Other game modes include team deathmatch, capture the flag, domination, and many mutators and weapon options like rocket arena and instagib. You can fight through the single-player campaign, going through more than 20 levels, or play online.
Bitfighter is a free multi-player 2-D space combat game with Robotron-like controls. It's a team-based strategy game featuring retro vector graphics and customizable ships. It's fast, fun, and frenetic. No package provided for Linux, but most recent release will compile and run.
MegaMek is an unofficial online version of the Classic BattleTech board game. This platform-independent software supports nearly all Total Warfare BattleTech rules and technology, with support for Tactical Operations rules and technology in progress. Aerospace rules are also included, with the exception of ground/air interaction.
Oolite is a 3-D space trading and combat simulator. You are the pilot of a spacecraft capable of interstellar travel to other nearby planetary systems using wormholes generated by the ship's engines. Each system in the core game contains one inhabited planet, with an orbiting space station where the player can trade and upgrade their ship. Open ended game with no set goal, other than to acquire the coveted Elite rating. Different star systems and economies offer many opportunites for a spot of trading, bounty hunting, pirating and occasionally repelling alien invaders. The game contains 5 in-built missions that will reveal themselves once the player gains some experience. The growing number of 80+ expansion packs available for this game provide extra missions, variety and surprises to discover along the way.
AssaultCube is a FREE multiplayer first-person shooter game, based on the CUBE engine. Taking place in realistic environments, with fast, arcade gameplay, it's addictive and fun! With efficient bandwidth usage, it's low-latency and can even run over a 56Kbps connection. It's tiny too, weighing in at a lightweight 40 MB package available for Windows, Mac and Linux. On the correct settings, it can even run on old hardware (Pentium III and above).
Fish Fillets NG is strictly a puzzle game. The goal in every of the seventy levels is always the same: find a safe way out. The fish utter witty remarks about their surroundings, the various inhabitants of their underwater realm quarrel among themselves or comment on the efforts of your fish. The whole game is accompanied by quiet, comforting music.
FreedroidRPG is a mature sci-fi isometric role-playing game with refined graphics and music tracks. The game tells the story of a world destroyed by a conflict between the bots and their human masters. Play as Tux in a quest to save the world from the murderous rebel bots. Besides the hack'n'slash action phases, dialogs with dozens of non-player characters take care of storytelling. The player can fight with melee or ranged weapons, take control of his enemies by hacking, and remotely execute code on enemy robots.
Netrek is a multi-player battle simulation with a Star Trek theme. You captain starships to engage enemy vessels, bomb armies, and invade planets in order to expand your team's space empire. The ultimate goal is to eliminate the enemy race, but the carnage of battles along the way is ruthlessly fast-paced and a lot of fun. It's a team-oriented strategy game with real-time dogfighting.
FlightGear is a multi-platform, cooperative flight simulator development project. The goal of the FlightGear project is to create a sophisticated flight simulator framework for use in research or academic environments, for the development and pursuit of other interesting flight simulation ideas, and as an end-user application.
Hedgewars is a turn-based strategy game. Each player controls a team of several hedgehogs. Players take turns with one of their hedgehogs to use whatever tools and weapons are available to attack and kill the opponents' hedgehogs, thereby winning the game. Each turn is time-limited to ensure that players do not hold up the game with excessive thinking or moving.
S.C.O.U.R.G.E. is a Rogue-like game with a modern 3-D interface that lets you rotate the view, zoom in and out, and view special effects. In the game, a group of four characters searches for treasure, kills enemies, and gains levels.
OpenLieroX is an addictive real-time Worms 2-D shoot-em-up backed by an active gamers community. It features online play; customizable weapons, levels, and characters; and dozens of levels and mods. The game is based on a deathmatch setting, where multiple players face off in a closed level. Each player is equipped with five weapons selected out of all the weapons allowed, and with a ninja rope that allows the player to move in any direction. Players begin with a set amount of lives, and while the game records the number of kills, the last man standing is usually considered the winner. LieroX also allows team deathmatches, which has made it common for players to form clans.
Smokin' Guns is a first-person shooter (FPS) with a Western theme. Weapons behave with historical correctness about damage, rate of fire, reload time, etc. Gametypes and maps are inspired mostly by movies. And to increase the feeling of a "gunslingers atmosphere" music tracks and sounds are adapted to this time period.
Warsow is a cyberpunk-style first-person shooter (FPS). Moving, speed, and tricks play a big part in the gameplay, but map control, aim, team play, and fragging skills matter too. Warsow has two firing modes for each weapon; by picking up a weapon, you will be equipped with the standard (weak) ammo for the weapon, but when you pick up an ammo pack, you will equip your weapon with special (strong) ammo. Weapons may have different damage or behavior depending on what ammo you use.
UFO: Alien Invasion is a squad-based tactical strategy game in the tradition of the old X-COM PC games. It combines military realism with hard science fiction. The carefully constructed turn-based system gives you pinpoint control of your squad while maintaining a sense of pace and danger. Over the long term you will need to conduct research into the alien threat to figure out its goals and use its powerful weapons for your own ends. You will produce unique items and use them in combat against your enemies. If you like, you can even use them against your friends with the game's multiplayer functionality.