Vanilla is a product of Lussumo:
Documentation and Support.
has caused them to worry about losing control of this monopoly, so they create their own version
Imagine you just make the jump to hyperspace and the computer crashes and won't tell you what the hell is going on. Or you are sling-shotting around the sun to travel back in time and save the whales and you get the blue screen of death. What would you do?
Users with a high tolerance for irritation can put off switching to genuine software indefinitely, but those who relent and buy a real copy of Windows can do so at reduced prices — $119 for Windows Vista Home Premium, half the regular retail price.