What documentation generator does Google use?

Google has a uniform documentation of all its apis. I wonder what documentation generator does it use and is it available f开发者_JS百科or public use. It has good TOC and other features. Also the code appears neat.

Can anyone shed more light on this?

I am not 100% sure but i think they are using Doxygen.Doxygen is a documentation system for C++, C,Java, Objective-C, Python, IDL (Corba and Microsoft flavors) and to some extent PHP, C#, and D.If you are working on Linux/Unix then you also generate pdf files as well.Many companies are using this. To know more Doxygen