Freeciv is a multiuser reimplementation for Unix/X of the famous Microprose game of Civilization. By default, the game is an improved Civ II, but this can be customized; modpacks for near-100% compatibility with Civ I and Civ II are included. Multiuser gameplay is real-time: in each turn, all human players move concurrently. The game is designed to remain fairly playable even on poor network connections. Freeciv can also be played on standalone machines, and its AI players are a good challenge for beginners. The source code comes with the server, two X clients, and non-X clients for MS Windows and Amiga. Freeciv is released under the GNU General Public License. It is maintained by an international team of coders and enthusiasts, and is easily one of the most fun and addictive network games out there.
TEG is clone of 'Plan Tactico y Estrategico de la Guerra', which is a clone of Risk, a networked multiplayer turn-based strategy game. TEG is not fully compliant with Risk; some rules are different. It has a server, a robot, a GNOME client, support for GGZ Gaming Zone, and IPv6.
ski is a game in which you ski down an infinite slope, facing such hazards as trees, ice, bare ground, and the man-eating Yeti. Since you have put your jet-powered skis on backwards, you can't see ahead where you are going; only behind where you have been. However, you can turn to either side, jump or hop through the air, teleport through hyperspace, launch nuclear ICBMs, and cast spells to call the Fire Demon. And since the hazards occur in patches, you can skillfully outmaneuver them. A fun and very silly game that proves you don't need fancy graphical user interfaces to have a good time.