[Twisted] PyDoctor as generator on ReadTheDocs?

Hi, I'm using pydoctor locally. ReadTheDocs.org do use Sphinx by default. But looking into the docs it seems to me that it should be possible to use every other tool to generate HTML out of your source code. Am I right? Does anyone knows a project using PyDoctor on ReadTheDocs? This question is specific to PyDoctor without(!) Sphinx involved. I do know that even youself do use Sphinx for the PyDoctor docu instead of using pure-PyDoctor. No Sphinx! Sphinx would not be an option not even in combination with something else. ;) Maybe asking the other way around: Are there alternatives to ReadTheDocs? Kind Christian