Free multiplayer chess software for linux

Vulcan Chess project allows you play against the computer in a chess variant inspired by a certain well-known science-fiction TV series.
Enhancements:
- Castling was added.
- The legal move generator is a bit faster.

TryChess project is a multiplayer online chess game.
First it was only a test to try PHP5s news features. But it started growing and became a nearly complete chess game with many features.
Main features:
- Multiplayer game
- Preview move
- Hostory of moves
- Check and Check mate detection
- Browser indepentant (even lynx works, but does not look so good :) )
- Special moves supported partialy (rochade,...)
- Top Score list
- Invite friend function
- "Whos online?"
- Forum
- Admin functions
- Search for users

IRC-Chess project is a 2-player chess game for IRC which turns a computer into an IRC chess bot.

It consists of a Java chess server, with frontend scripts to convert an IRC client into a chess bot. Players then communicate with the bot using standard IRC commands, and dont require any special software to play.

Frontend scripts are available for IRSSI and X-Chat.

The client is merely responsible for interpreting this data and displaying it. In this way, porting the system to a variety of IRC clients is very simple, since
the client script will be short, and effectively contain no code specific to the game being played.

In other words, the Java part is smart. The script is dumb and is just there to make things look pretty.

This idea works. Currently, client scripts have been designed for RSSI and XChat. Since both these programs use Perl for scripting, the scripts are practically identical, with a few client specific modifications.

Porting this script to other IRC clients shouldnt be too much of a hassle, since its just the frontend thats ported, not the chess game itself. Anyone wanting to create frontend scripts for other IRC clients, please feel free to do so.

The PROTOCOL file describes exactly what needs to be done.

GNU Chess project is a computer program which plays the Game of Chess.
GNU Chess lets most modern computers play a full game of chess.
It has a plain terminal interface but supports visual interfaces such as X-Windows "xboard" and Windows-for-PC "winboard" as well as a full 3-dimensional wooden chess-board protocol for the Novag Chess board enabling one to be relatively free of the computer itself.
Enhancements:
- Minor ScoreDev code tidy
- ensure gnuchessx included in EXTRA_DIST
- Fix to Posix thread for readline
- Fix to ensure "HARD" is default
- Improve Posix thread handling
- Portability fix IsTrustedPlayer
- Portability fix to lexpgn.l
- Changes to lexpgn.l to handle some special cases
- Fix trailing "/" in FEN causes buffer overflow issues.
- Portability fix to lexpgn.l

Tonic Chess project is an online chess software.

Tonic is a graphical interface for playing online chess. It is based on Jin.

From now on Tonic is really open source software (and free as in libre as well) - I managed (I had some problems last time I tried) to import source to cvs sourceforge repository. It is a bridge2 release source with few little modifications. You can read how to get it from cvs here. If you are impatient pastenenter in console:

cvs -d:pserver:anonymous@tonic-chess.cvs.sourceforge.net:/cvsroot/tonic-chess login

When prompted for password just hit enter. And then:

cvs -z3 -d:pserver:anonymous@tonic-chess.cvs.sourceforge.net:/cvsroot/tonic-chess co -P tonic

You should see a list of files downloaded from cvs repository. If you are a non-console user (i.e. Windows or Mac user) I recommend visiting this site. I myself use Linux for development. And Netbeans sometimes as you could figure out from examining the contents of tonic directory. So, enjoy the opensourceness of Tonic!

I uploaded new screenshot to Tonic project site. It is Tonic in Aero GTK engine tuxedo. Quite a peculiar engine imo, but you can use other GTK engines if you run Tonic in Java 6 aka Mustang (you know you can get it from here, dont you?) I test Tonic with Mustang and Ive problems with tray icon. After some searching Ive realized why Tonic crashed under Java 6 - the problem was tray.jar plugin and its dependencies - tray.so or tray.dll, so if you want to run Tonic on Java 6 move them away from theirs directory. Ive written a class for tray icon using new desktop API from Mustang, but it doesnt work as expected in KDE (tray icon is invisible) ; GNOME is better, but I have to work on the popup menu. Well, what could I say? Mustang is in beta stage, but it has some goodies to wait for (early splashscreen, access to tab component, ...).

Ruby Chess is a chess game implemented in Ruby using GTK2. Ruby Chess project has a good artificial intelligence that is heuristic-based and stochastic.

Java3D chess project is a Java applet that allows you to play chess.

Java 3D Chess is a chess program with uses Java 3D. You can play the game on any computer capable of using Java.

You can play Java 3D Chess agains yourself or a friend (on the same computer).

Maybe inthe near future you can play against other as well.

MKGI Chess Club is a chess playing server with a pure Web interface.
It features complete player profile management, full html email notification with embedded board display.
MKGI Chess Club also features an interface to match against chess engines such as gnuchess, phalanx, and crafty.
Enhancements:
- Fixed the notification feature which was broken since 1.6.0.
- Fixed undo availability immediately after a move.
- Implemented partial dragndrop of pieces on the chess board.