XPilot
XPilot was created in 1991 by Bjørn Stabell and Ken Ronny Schouten, students in computer science at the Tromsø university (Norway), as a multiplayer game similar to Thrust. They received a lot of patches and feedback when they released the first public version. The game has been improved a lot by players from all the world and has many contributors. Originally only available on UNIX, it was ported on the Mac OS and Microsoft Windows. It has been forked and new versions appeared: XPilot 5 and XPilot NG (Next Generation).