This Ocarina of Time romhack is called NekoJam, and from what I read was originally created for the Alternate Worlds Hack Jam. It seems to just be a demo of something that went unfinished, but it has a really cool world that I enjoyed exploring.
Zelda romhack playlist:
https://www.youtube.com/playlist?list=PLCeQvsbGaThG-fGyHjA93M5rir8g69G3m
