It was the PS3, and I don't believe you had to buy anything. It had "other OS" functionality for effectively dual-booting Linux on it, which they removed partway through it's lifecycle in a firmware update.
That pretty much kickstarted and supercharged the PS3 hacking scene.
true, btw ps3 was cracked because sony said in a conference that they were going to remove the otherOS support from the ps3, and lost a lawsuit because of that lol