Final Fantasy d6
This is a completely standalone system at over 250 pages, with a power level much closer to Exalted than Dungeons and Dragons.
In my time working with the Final Fantasy-verse, I've developed a theory that I'd like to share with you.
It takes a special kind of love to tackle a project of this magnitude and still finish it without absolutely loathing the source material. I've received 'helpful' emails explaining (in rather graphic detail) the reproductive cycle of the Seeq. I've been told the system is garbage because I didn't include a segment on how buster swords are the bestest weapons ever. I've spent sleepless nights poring over hundreds of wikipedia articles and sat beside a flickering Nintendo DS screen taking notes on fauna.
And yet, after all that, I still find going, "HELL yes," when Snow in FFXIII - quite conceivably one of the worst games ever made - takes out guards on his elemental...motorbike summon. I still crack a smile at "You spoony bard!" And I don't even bat an eye when I need to grind underwater foosball for fifty hours to get a character's ultimate weapon.
The FFd6 started as a project because I was dissatisfied with the other options out there. It saw completion because it was a labor of love. I hope someone out there gets some use out of it.