The Wooting Analog SDK can be used to get raw analog values from any analog keyboard.
It is open-source and written in Rust and is cross-platform, with a C FFI interface which is the primary method of communicating with the SDK. You can find the main repository on GitHub. With the C FFI interface, the SDK should be portable to most languages, we have some libraries written for other languages such as C#.
If you wish to learn more, have a look at our Overview, Getting Started with C# and .NET Core or the C API Reference page