complete Go board

cgoban

complete Go board

CGoban (Complete Goban) is a computerized board on which you can play the game of Go against another player, view and edit smart-go files, and connect to Go servers on the internet. It can also interface with computer Go programs such as GNU Go that speak the Go modem protocol. Some sort of image converter is needed if you wish to use the utility provided to capture "screen shots" of a CGoban game.
chocolate-doom running freedoom WADs

chocolate-doom

Doom engines closely-compatible with Vanilla Doom

Chocolate Doom aims to accurately reproduce the original DOS version of Doom and other games based on the Doom engine in a form that can be run on modern computers. Unlike most modern Doom engines, Chocolate Doom is not derived from the Boom source port and does not inherit its features (or bugs).
Fast-paced 3D first-person shooter

nexuiz

Fast-paced 3D first-person shooter

Nexuiz Classic is a fast-paced 3D deathmatch game with high-end and complex graphics effects. It is intended to be played over the Internet or over a local network. Several different game types, such as classic deathmatch, team deathmatch and capture the flag are available. It also supports a single-player mode and playing against the computer.
interpreter of Z-code story-files

frotz

interpreter of Z-code story-files

Frotz interprets Z-code story-files, which are usually text adventure games (although a few arcade-style Z-code games have been written). Examples of such story files include the adventure games published by Infocom, as well as any games produced by compilers to this format, such as Inform. You can find a number of Inform-compiled games up for anonymous FTP at ftp://ftp.ifarchive.org/ or HTTP at http://www.ifarchive.org/
chess database

chessx

chess database

With ChessX you can operate your collection of chess games in many ways: browse, edit, add, organize, analyze, etc.
Collect powerups and avoid your opponents' trails

heroes

Collect powerups and avoid your opponents' trails

Heroes is similar to the "Tron" and "Nibbles" games of yore, but includes many graphical improvements and new game features. In it, you must maneuver a small vehicle around a world and collect powerups while avoiding obstacles, your opponents' trails, and even your own trail.