The MetaWear C++ API provides a low level implementation of the MetaWear Bluetooth LE protocol that can be used in C/C++ projects or by higher level languages such as C# and Python; it does not provide any Bluetooth LE functionality. Precompiled shared libraries (gcc 4.8.5 on openSUSE Leap 42.1) and source code are available on the Metawear-CppAPI project page.
For C# developers, the C++ API is published as a Windows Runtime Component on NuGet . On the Python side, Henrik Blidh (GitHub) is working on a Python client that can call into the library. You can check out his work on the pymetawear project page.