Available free of charge, the game thrusts players into an epic bug hunt featuring a unique blend of co-op play and squad-level tactics. With your friends, form a squad of four distinct IAF Marine classes. Plan your attack using an unlockable arsenal of weapons with countless loadout configurations against a wide variety of aliens. Blaze your way through an overrun, off-world colony, eradicating the alien infestation in environments ranging from the icy planet’s surface, to a subterranean lava-flooded mining facility.

Along with the game get the complete code base for Alien Swarm that features updates to the Source engine as well as the SDK. Alien Swarm adds 3rd person camera, depth of field, improved dynamic shadows and a wide variety of gameplay additions to the Source engine.

* Tactical, 4 player co-op action game with a top-down perspective.
* Complete game code and mod tools
* Unlock persistent items by gaining levels
* Over 40 weapons and equipment with countless loadout configurations
* 4 unique classes and 8 unique characters
* Matchmaking, Steam Cloud, Steam Stats
* 64 achievements
* Tile-based map generation tool
* Powered by Source and Steam

No registration required: Download, install, play!

OpenArena’s gameplay is the exact same as Quake III Arena – score frags to win the game using a balanced set of weapons each designed for different situations. Gameplay modes exist such as deathmatch, Team Deathmatch, Tournament, and Capture The Flag (all modes also in the original game). Bot support was added in version 0.6.0.

OpenArena has undergone compatibility testing with some Quake 3 mods.Open Arena does not have a set story line. The models do not follow a set theme with some being military, fantasy, or oriental themed.

Some of its features include:

* 3D Engine based on Qfusion (a modification of Quake 2 GPL engine)

* eSport oriented FPS

* Fast-paced gameplay focused on trix (trick jumps) and art of move

* Complete Power-up System including Weak and Strong fire mode for each weapon

* Cartoonish graphics with celshading-like_but_not_Manga style, mixing dark, flashy and dirty textures, matching with action full of fun and speed

* References : Quakeworld, Quake3 CPMA, Jet Set Radio, Speedball.

There are 46 standard maps to choose from, 5 player characters, and 9 weapons with alternate fires, and a grappling hook. The game is powered by the id Tech 2 based CRX Engine, which features 32 bit hi-res texture support, shaders, textured particles, stain maps, reflective water with refractive shaders, light bloom, real-time shadows, real-time vertex lighting, normal-mapping, and other modern effects, all of which can be turned on or off in the menu.

Also featured is an internal server browser for finding other people to play online and the external Code Red Galaxy program which also serves as an IRC interface.

The game currently has singleplayer and multiplayer modes. Multiplayer functionality is possible with LAN, Local, and Internet play, which gets its server data from a master server.

Online offers deathmatch, last man standing, and “capture” gameplay (where teams vie over control of points on the map), as well as online cooperative map editing, which is one of Sauerbraten’s most interesting and popular features.

There are also single player modes featuring both episodic gameplay and also deathmatch on multiplayer maps with AI bots instead of human opponents over the internet.

While Nexuiz is not intended to be an eye-candy laden game, it does feature many advanced effects such as coronas, bloom, Realtime World and Dynamic Lighting and shadowing, shaders (with OpenGL 2.0), offset mapping, and High dynamic range rendering. All these effects can be turned off to make the game run on older hardware. Nexuiz has such a range of effects that enabling all of them would result in an unplayable experience, apart from on the most cutting-edge of hardware.

Nexuiz is primarily multiplayer (though it includes a full single-player campaign, which allows one to play through the various multiplayer game types and maps with bots), and allows for hosting and joining of games. It can also support new gametypes, or whole conversions quickly applied to it (much like Quake). Nexuiz supports most, if not all, Quake modifications (although with varying functionality). Currently there are a few custom mods and maps used.

System Requirements:

400 MB of hard drive space
Windows 2000/XP/Vista (32-bit or 64-bit)
Mac OS X 10.4 or better (PPC or x86)
Linux Kernel 2.2 or better with glibc

Players on both teams are able to build working structures in-game like an RTS. These structures provide many functions, the most important being spawning. The designated builders must ensure there are spawn structures or other players will not be able to rejoin the game after death. Other structures provide automated base defense (to some degree), healing functions and much more…

Player advancement is different depending on which team you are on. As a human, players are rewarded with credits for each alien kill. These credits may be used to purchase new weapons and upgrades from the “Armoury”. The alien team advances quite differently. Upon killing a human foe, the alien is able to evolve into a new class. The more kills gained the more powerful the classes available.

The overall objective behind Tremulous is to eliminate the opposing team. This is achieved by not only killing the opposing players but also removing their ability to respawn by destroying their spawn structures.