Arasan is a chess program for Windows, Linux and Mac OS. It is copyrighted, but allows free distribution, with some restrictions. The latest version is Arasan 12.3, released in February, 2011. The Windows version runs on Windows 95 or more recent versions. The Linux and Mac OS version comes in source only and requires gcc 4.2 or higher to build. Arasan has both a native Windows user interface and a console-based chess engine for use with Winboard or xboard. Arasan also works with Arena, another free chess interface, and with UCI-compatible programs like Shredder. Arasan includes an opening "book" with over 200,000 moves. Arasan has always been free software, but if you like it, you can make a voluntary contribution to support its development.

Arena is a free Graphical User Interface (GUI) for chess. Arena assists you in analyzing and playing games as well as in testing chess engines. It runs on Windows XP or higher or on Linux with Wine 1.0 or higher. Arena is compatible to Winboard protocol I, II and UCI protocol I, II. Furthermore, compatible to Chess960, DGT electronic chess board & DGT clock XP, Novag Citrine, Autoplayer, ICS (chess servers) and much more.

Der Bringer is a chess program designed by Gerritt Reubold, of Germany. Der Bringer is not freeware but you can download and use it for free. Der Bringer works well in Windows 95/98, ME, 2000 and XP. Der Bringer can beat most intermediate-level players. On a 133-MHz Pentium, with 40-MB hash tables, Der Bringer 1.6 achieved a rating of 2150 in the LCT2 positions test. Der Bringer can be used with the Nalimov Endgame Tablebases. You can download the tablebases from ftp://ftp.cis.uab.edu/pub/hyatt/ The User's Guide includes instructions on setting Der Bringer to use the tablebases. Der Bringer has a very clean and easy to use GUI (click the VIEW INTERFACE button to see a full-size screenshot), and offers a great deal of flexibility for creating custom opening books and analyzing games and positions. Best of all, it uses very little room on your hard drive (<2 MB). An opening book is supplied with the program, and a larger opening book also is available through the link. I've created a few custom opening books that you can download from this site.