If you read about the development of FATE you'll find that it started as an offshoot for Amber. That Fred Hicks and Jim Butcher met each other on an Amber Mush years ago (before either had been published) and that the game more or less grew from those roots.
Speaking of Amber, Rite Publishing is coming out with a new Amber Diceless Role Playing book. The reason Amber is crossed out? They don't want to have to reopen discussions with the estate and they aren't buying the license so they are licensing the system and not the setting. The new setting will be compatible with the old one but not based around Amber, Chaos, etc. It should be interesting to see when it comes out.
Richard