"doctools" is the informal name of the Python documentation toolset. New version of this toolset is better known as Sphinx. It uses DocUtils, reStructuredText as markup language and builds HTML and other formats out of that.
Sphinx can be found in Mercurial repository at https://www.bitbucket.org/birkenfeld/sphinx/
Former doctools are located in Subversion at https://svn.python.org/projects/doctools
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