Naruto d20?
Naruto: d20 is one of the largest, if not the largest, anime-to-d20 conversion currently available, weighing in at over 1100 pages of pure content, including over 1000 techniques, more than 20 new advanced and prestige classes, and over 70 new feats, including meta-chakra feats, a new and improved chakra and technique system, as well as a complete and legit set of epic-level rules for d20 Modern, and much more.
It all started in late 2004 as Frankto’s first serious project, and had been worked on and off for a few month, when things picked up with public interest in mid-January 2005, when the file was first made available for the public eye. Now, more than 1,000,000 hits and 85,000 downloads later, things are starting to pick up again. Who knows what the future holds?