Sphinx is a tool that makes it easy to create intelligent and beautiful
documentation, written by Georg Brandl and licensed under the BSD license.

It was originally created to translate the new Python documentation, and it has
excellent support for the documentation of Python projects, but other documents
can be written with it too. [...]

Sphinx uses reStructuredText as its markup language, and many of its strengths
come from the power and straightforwardness of reStructuredText and its parsing
and translating suite, the Docutils.