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4st Attack is a good looking connect-four with multiplayer support. It also has theme/skinnability and a decent AI to hone your skills.

The goal of the game is to connect four pieces of your color in a row. The tricky part is that your oppenent is doing the same thing. And who ever does this first wins.

License: free

Additional System Requirements: < a href="http://www.pygame.org">Pygame(www.pygame.org)
Python(www.python.org)

The Doomsday Engine is an enhanced Doom source port, based on the source code of id Software's Doom and Raven Software's Heretic and Hexen. The purpose of the project is to create versions of Doom, Heretic and Hexen that feel the same as the original games but are implemented using modern techniques such as 3D graphics and client/server networking. A lot of emphasis is placed on good-looking graphics.

License: free

Additional System Requirements: FreeDoom or a commercial or shareware
Doom/Heretic/Hexen wadfile.
A graphics card with hardware accelerated OpenGL support.
SDL, SDL-mixer, and SDL-net (svga-lib for console).
Soundpacks from Sycraft.org (for background music) if your system does not support MIDI.
Also see the links and futhermore take a look at jDUI (UI enhancement)

5.56mm Full Metal Jacket is a multiplayer modification which takes place in a fictive Environment where you have a West and an East team. Accordingly to your team you will get the full weapon-arsenal available supported by your side.

There are 5 classes of weapons .... Pistols, Shotguns, Sub-Machineguns, Assault Rifles and Sniper Rifles. The target system will feature 2 modes ... Aiming with the cross-hair which gets less and less precise the further away you shoot or aiming through the weapons sights which influences the overall field of view but therefore is damn pretty precise.

The game features first- and thirdperson view though when in thirdperson the lack of a crosshair makes aiming more difficult. The levels will vary between huge outdoor scenarios and narrow office corridors.

Supported gametypes are: Capture the Flag, Team DeathMatch

Supported weapons so far are:
• Pistols: RUGER MK 512, GLOCK 17
• Shotguns: BENELLI M3, EICHLER
• SMGs: MP5SD6, MAC10
• Assault Rifles: XM177E2(AR15), AK-47
• Sniper Rifles: AWM, M24

License: free

54321 is five games in four-, three-, or two-dimensions for one player. 54321 takes five classic two-dimensional puzzle games and extends them into three and four dimensions.

54321 was created for the 1mb SDL Game Programming Contest sponsored by: Linux Journal, Loki Software, and No Starch Press.

License: free

Additional System Requirements:

• SDL1.2
• SDL_image
• libpng
• zlib

A Gnome game for two players (you can also play alone against the computer). You have to color the half + 1 of the rhombs on the screen before your opponent does. Playing against a friend is very funny!

License: free

In this game you have to find a nine-letter word by going around a 3x3 square from letter to letter forwards, backwards and diagonally.

License: free

Additional System Requirements: Gambas