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.
Panda3DS compiles on Windows, Linux and MacOS, with only 1 (optional) system dependency, the Vulkan SDK. If you don't want to install the Vulkan SDK you can always build the emulator with only OpenGL support, by adding -DENABLE_VULKAN=OFF to the cmake command
All you need is CMake and a generator of your choice (Make, Visual Studio, Ninja, etc). Simply clone the repo recursively and build it like your average CMake project.
git clone https://github.com/wheremyfoodat/Panda3DS --recursive cd Panda3DS && mkdir build && cd build cmake .. -DCMAKE_BUILD_TYPE=Release -DENABLE_USER_BUILD=ON # Set up compilers etc here if you'd like <Invoke Make, Visual Studio, or whatever you would like to use>