"Fate" refers to a family of tabletop RPG systems by Evil Hat Productions, not a single game. Major editions:
Anthology setting books (Vol 1–2) with 4–5 mini-settings each (e.g., CrimeWorld, Camelot Trigger, Gods and Monsters).
Total distinct "versions": 4 core editions + 10+ standalone games + numerous setting hacks. All share the Fate Point economy + Aspects core.