TRON (Tron Revisited On Network) is a 3D open-source Tron-like game programmed in C using OpenGL and licensed under the GPL v3.
TRON is a also a network-oriented game that can be played over the internet (UDP server/client interface) and who features fun implementations as missiles for the lightcycle, and various game-modes, as Deathmatch, Team Deathmatch and Escape the Grid (one player versus all others has to run into a hole in the big grid, the others have to kill him before).