libjoycon 
A Joycon packet encoding and decoding lib
Build
The library itself only links to the libm (math lib):
mkdir build && cd build
cmake ..
make
If you want to build examples, the HIDAPI lib is a must. The OpenGL and GLUT/Vulkan is necessary to build IMU Mapping. Configure the project with BUILD_EXAMPLE as follows:
cmake -DBUILD_EXAMPLE=ON ..
Usage
Please refer the programs in examples.
Note
Note that this library does not contain Bluetooth/USB HID implementation, you can use one on a specific platform, e.g. hidapi on Linux/Win, to read/send raw packets, and use this library to extract/encode information from/to the packets.
Have fun
What can it do? Check this twitter: