Xeon

Xeon was a surprising Xbox emulator and the first to get a commercial game in-game. It could only ever run a single Xbox game, Halo: Combat Evolved.

Even then, it was far too slow to run the game at a playable speed.

Despite its short life, Xeon showed that emulating the original Xbox was not an impossible task.

Xeon never had another release and joined the long list of abandoned Xbox emulators. Xbox emulation has since moved on considerably, and xemu can now run a large part of the Xbox library.