This is probably old news to a few people, but this is new to me and a few friends of mine. As far as I can tell, it's all homebrew. The game, the work, everything. http://www.kobolds-keep.net/downloads.html
The Legend of Zelda, and Super Mario.
They're both quite well done, but I prefer the Zelda one myself. It's even got Pathfinder updates for the Races and everything else (in colour of b&w). I'm hoping to someday do a campaign of this with a friend of mine who's a huge Zelda fan, and his girlfriend.
In the sourcebook, while it doesn't look 100% completed but still put out there, it's got the write ups of all the Zelda characters, and all the games they've been in (minus the original Ganon who's possibly a Deep Orc in his final form, and Link in Link to the Past).