Netrek

Netrek is a 16-player graphical real-time battle simulation with a   
Star Trek theme. The game is divided into two teams of 8 (or less),     
who dogfight each other and attempt to conquer each other's planets.     
There are several different types of ships, from fast, fragile scouts     
up to big, slow battleships; this allows a great deal of variance in     
play styles.     

REQUIRES: Win32s or Win95, SLIP or PPP connection, and some sort of
Winsock