We do have "Python API" and "Unity API" that are released and you can find details of them here:

Python API:
https://eteexr.com/blogs/news/etee-python-api-now-available-on-github
Unity API:
https://github.com/eteeXR/etee-Unity-API

eteeController用のUnity SDKはありますか?

「Python API」と「Unity API」 がリリースされており、詳細はここで見つけることができます: 

Python API:
https://eteexr.com/blogs/news/etee-python-api-now-available-on-github
Unity API:
https://github.com/eteeXR/etee-Unity-API