D.I.P.R.I.P. is a Half-Life 2 multiplayer total conversion. Gameplay is based on vehicle combat in various post-war environments. Vehicles use multiple weapon mounts which are activated by finding weapons scattered around the battle grounds. Planned game types are deathmatch, teamdeathmatch and capture the flag. There will also be a possibility to enable players to upgrade their vehicles' weapons and subsystems through the use of a 'money for damage' system.

http://diprip.com/news.php5

Project Reality is a free to download game modification for the Battlefield 2 (BF2) retail windows game. The Reality Mod installs alongside the existing game installation allowing both the original game and Project Reality to be played separately without causing conflicts.

The Mod developers aims are to rework the original game engine developed by Digital Illusions of Sweden (Dice) within legal and feasible constraints to create a more realistic combat environment for the gaming community. This includes adjusting various gameplay elements including physics, visual effects and overall game play formats. Along with changes to how the game handles, the PR team has introduced the British, Russian, Taliban and Insurgent factions, plus a number of community assisted factions are currently in the works to introduce Canadian, IDF forces and multiple others to the virtual battlefield.

Project Reality has won second place two years running in ModDB.com's annual Mod of the Year competition (2006 & 2007), culminating in first place in 2008. The competition is the definitive event that showcases the best mods and indie games in the world and recognises the teams behind them.


http://www.realitymod.com/

Battlefield Play4Free (sometimes abbreviated BF: P4F) is a first-person shooter video game developed by EA Digital Illusions CE and Easy Studios and published by EA. Based on the Battlefield series, the game features a modern warfare battlefield setting. Play4Free is built on a modified version of Battlefield 2's game engine, with improvements such as high resolution artwork and post-processing effects. The game is also less demanding on computer specifications, similar to Battlefield Heroes.

As the game’s title suggests, the game is available to players for free online, under Electronic Arts' "Play4Free" model. Play4Free uses a similar micro-transaction store system similar to that in Battlefield Heroes. Battlefield Play4Free was announced on November 5, 2010. The game's open beta testing phase began on April 4. Closed beta codes originally started being distributed via email on November 30, 2010. The game was released on April 4, 2011. The game runs in a browser plugin, although approximately 1.3GB of game data is downloaded to the hard drive.


http://battlefield.play4free.com/

Zineth

http://arcanekids.com/

Grey is a total conversion Half-Life 2 horror modification where the player must solve puzzles, fight to survive, and find out what is happening to the world around you. We have made a lot changes to the base Source engine and have added countless new mechanics in the mod such as the objective indicator, portable medkit, donator based extras, pickup animations, failed reloads, new picture based GUI elements and much, much more!

http://grey-mod.com/

Flare

http://www.desura.com/games/flare

This looks really good, installing now. Thanks for the heads up!

Might as well put this here:

http://www.desura.com/groups/bundeals/forum/thread/all-free-games-on-desura-courtesy-of-agtv

bear in mind that it is not 100% correct.

Started on June 2002, Yoda Soccer is a project which intends to create a new free game for Windows with the gameplay and the style of the well known Sensible World of Soccer (a.k.a. SWOS). This doesn't mean that we'll redo swos for this OS, it would be only a waste of time, but we'll try to add many features missed in Swos.
Yoda soccer is written in Blitzmax (www.blitzmax.com) language. The source code is open and availaible for everyone who want to help us to improve the game.

http://yodasoccer.sourceforge.net/dloads.htm

ADOM link could use updating. Also, build 1.2.0. is in pre-release currently.

Xonotic is a free and fast-paced first person shooter for Linux, Mac, and Windows. It combines addictive, arena-style gameplay with rapid movement and a wide array of weapons. Xonotic is available under the permissive GPLv2 license.

http://www.xonotic.org/

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Open Quartz is a project to supply GPL'ed artwork in the form of PAK and WAD files to create a fully GPL game based around the GPL'ed quake sourcecode.This includes models, maps, soundfx and textures.

http://sourceforge.net/projects/openquartz/

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Tremulous is a free, open source game that blends a team based FPS with elements of an RTS. Players can choose from 2 unique races, aliens and humans. 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...

http://tremulous.net/

GL-117 is an action flight simulator for Linux/Unix and MSWindows. Enter the Eagle Squadron and succeed in several challanging missions leading though different landscapes. Five predefined levels of video quality and an amount of viewing ranges let you perfectly adjust the game to the performance of your system. Joystick, mouse, sound effects, music...

http://www.heptargon.de/gl-117/gl-117.html

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BillardGL is an OpenGL pool billiard simulation, which was developed within the scope of our course "Computergraphics" at the University of Freiburg (Germany). BillardGL is puplished under the GPL and is available for download for Windows and Linux.

http://www.billardgl.de/index-en.html

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FlightGear is an open-source flight simulator. It supports a variety of popular platforms (Windows, Mac, Linux, etc.) and is developed by skilled volunteers from around the world. Source code for the entire project is available and licensed under the GNU General Public License.

http://www.flightgear.org/

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FooBillard (official home page: http://foobillard.sunsite.dk/) is a free (libre; licensed under GPL2) OpenGL billiard game for Linux by Florian Berger. This is the page for ports of FooBillard hosted on SourceForge. At the moment, a Win32 port is hosted here. The official page has an OS X port and older Win32 ports. There is also a Polish version, see below for more information.

http://foobillard.sourceforge.net/

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The "Ice Hockey Manager" (IHM) is a hockey team managament game running under Linux, MacOS and Windows. Checkout our home page for further informations!

http://sourceforge.net/projects/ihm/

Football Playbook

From site:

[i]"The Football Playbook is a “digital collection of tactical puzzles”.
In each puzzle you are presented with a snapshot of a football match.
To successfully complete the puzzle you must get the ball from the goalkeeper to the striker.
Play and solve 42 unique and challenging puzzles."[/i]

Game can be downloaded for free from the developers site:

http://www.footballplaybk.com/

Of Light and Shadow

http://download.oflightandshadow.at/OfLightAndShadow.exe

http://steamcommunity.com/sharedfiles/filedetails/?id=102460005

I can't believe that there's still no <span class="bold">HydoraH</span> here.... ;p

Shooter/Shmup

"Choose the path to follow and fight planet by planet against hordes of meroptians. Hydorah features lots of short and intense levels with fantasy spacial landscapes, unlockable weapons, secrets, and a large library of enemies and bosses. There is a single dificulty level, based on the 80's standards. It can be hard, but with every beaten level there will come the glory. (...)

Take the controls of your ship and prepare to die!"