BZFlag is a 3D, multiplayer, tank battle zone, capture the flag game that pits players against each other in a networked environment. It runs on Windows 95/98/NT/2000, Linux, MacOS 10.x, Irix, Solaris, and others. An OpenGL accelerator is highly recommended, but it is playable with 3D in software.
TuxWordSmith is similar to the classic word game "Scrabble", but with Unicode support for multiple languages and character sets. The game is currently distributed with 42 dictionary resources for playing Language[i]-Language[j] "Scrabble". For example, if configured to use the French-German dictionary, then the distribution of available tiles will be computed based on frequency of occurrence of each character of Language[i] (French), and, for each submission, the corresponding definition will be given in Language[j] (German).
Battle Just Started is 3D arcade tank battle game. Rendering is done using OpenGL, and direct rendering is recommended. The game is focused on multiplayer over LAN. An AI is also present, but is not very strong. World simulation is done via ODE, and sound is done using OpenAL and SDL_mixer. The game has currently 6 maps, 5 tanks, and 4 weapons.
Eliot is a Scrabble game. It offers four different game modes (standard game, duplicate mode, training mode, and arbitration mode), to play alone, against the computer, or with other players. Several variants are also available (joker, explosive, 7 among 8). Eliot supports different dictionaries, and provides fast and powerful search tools (including search by regular expressions).