Yeah, there is, its called "DaedalusX64"
Drop your Roms under: /3ds/DaedalusX64/Roms/
(In -.z64 format)
I've tested following games
- Mario Kart 64: Working
- Super Mario 64: Working
- Super Smash Bros: Working
- Zelda Ocarina of Time: Working
The only downside is the audio, bc its stuttering...