Goben is a GTK+ 1.2 GUI for playing Go. It allows any combination of human vs. computer, computer vs computer, or human vs human play, and supports any board size from 5x5 to the full 19x19. Computer players are controlled via GTP for compatibility with GNUGo and other GTP talking Go programs. SGF support is provided for saving, loading, and continuing games.
Hinversi is a implementation of Reversi (a.k.a. Othello), a board game in the style of Go. It can support many frontends and backends, so you can select how clever your computer opponent is, and whether you like to play using the console or a GUI. You can also let one AI engine play against another one.
Live Poker is an OpenGL-based multiplayer poker client. Its features include customizable 3D characters, professional character voices, in-room chat, an integrated private chat system, advanced actions for speedy game play, and all the classic poker games (e.g. Hold 'em, Omaha, and Hi-Low). Native clients are available for Mac OS X 10.3-10.4 and Windows.
PilotGOne is a GO game viewer and recorder for PalmOS. It uses the Smart Game Format (SGF) for input and output. PilotGOne can play back existing SGF files with variations and comments, and it can also be used as a board for stand-alone play. It uses only 42 Kb of Palm Pilot memory, and it supports comments, marks/labels, and annotations. Other features include Zoom-In for bigger image, editing of game records, sorting/searching of games, handicaps, Komi, and board sizes 5x5, 9x9, 13x13, and 19x19.