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.
"The Game" is a project designed to simplify the process of producing any high-quality cross-platform 2D or 3D graphical computer game. The hope is that any game can be produced simply by changing a few settings and pressing a "compile" button. The project has three "deliverables": a game engine library to abstract across the set of all possible computer games (applying object-oriented design methods to the general problem in such a way as to be usable in specific instances); a graphical interface for easy game design (an exercise in human interface design); and a gaming package with a lot of shiny games to play.
Galcon is an awesome high-paced multi-player galactic action-strategy game. In the game you send swarms of ships from planet to planet to take over the galaxy. It's like arcade action Risk with planets! Anyone can play, and it only takes 30 seconds to learn. Multi-player network games support up to 12 players with teams, and 15 different single player missions against 7 different computer players are provided.
Galcon Fusion is a high-paced, multi-player, galactic, arcade-strategy game in which you send swarms of ships to defeat enemy planets and conquer the universe. It features beautiful HD graphics, a full-length interactive soundtrack, achievements and detailed rankings, a variety of games including Stealth and Assassin, a retro mode, and colorblind support for up to 4 players. It supports multi-player, team games, and solo missions.