A Chankiller is a very intelligent but very, very rare species. Not many have been found in the wild. They have the ability to speak the language of which where they are found. A Chankiller is known to be loyal and be peaceful towards humans, but if you show any signs of aggression, or be rude to it, it will act back.
n. software that is no longer sold or supported by the original publisher / developer, often found as free downloads on the internet because it cannot be obtained elsewhere. Not legal, but often seen as morally acceptable because the company that made it is no longer selling the title, nor releasing it as freeware, therefore abandonware is "keeping the gamealive", so to speak.
Doom II is not abandonware because idstill sells it, while The Incredible Machine is not sold, therefore is abandonware.