[Sphinx][] is a publishing tool that is generally used for [[Python]]
documentation, although it can be used for other documents as well.
Sphinx is primarily based on [reStructuredText][rst], and there are
all sorts of [useful extensions][ext] (e.g. [intersphinx][],
[pngmath][], ...).  There is a good [tutorial][] in the
[documentation][].

If you're writing a lot of Python, you should probably consider the
[numpydoc][] package, which tries to [strike a balance][balance]
between full markup for Sphinx publishing and raw readability.

[Sphinx]: http://sphinx.pocoo.org/
[rst]: http://docutils.sf.net/rst.html
[ext]: http://sphinx.pocoo.org/latest/extensions.html#builtin-sphinx-extensions
[intersphinx]: http://sphinx.pocoo.org/latest/ext/intersphinx.html
[pngmath]: http://sphinx.pocoo.org/latest/ext/math.html#module-sphinx.ext.pngmath
[tutorial]: http://sphinx.pocoo.org/latest/tutorial.html
[documentation]: http://sphinx.pocoo.org/latest/contents.html
[numpydoc]: http://pypi.python.org/pypi/numpydoc/
[balance]: http://projects.scipy.org/numpy/wiki/CodingStyleGuidelines

[[!tag tags/tools]]
[[!tag tags/programming]]
[[!tag tags/python]]