Panda3DS is an HLE, red-panda-themed Nintendo 3DS emulator written in C++ which started out as a fun project out of curiosity, but evolved into something that can sort of play games!
Compatibily has gotten pretty good in the past couple of months. The only caveat is that the emulator still does not have sound.
The emulator is extremely slow on my Galaxy Note 20 Ultra, making games unplayable.