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.. _easy_install: https://pypi.python.org/pypi/setuptools
.. _Graphviz: http://www.graphviz.org/
.. _PSTricks: http://tug.org/PSTricks/main.cgi/
.. _PGF/TikZ: http://www.ctan.org/pkg/pgf
.. _MIT: http://opensource.org/licenses/mit-license.php
.. _Python: https://www.python.org
.. _pyparsing: http://pyparsing.wikispaces.com/
.. _pydot: https://pypi.python.org/pypi/pydot
.. _preview: http://www.ctan.org/pkg/preview
.. _preview-latex: http://www.gnu.org/software/auctex/preview-latex.html
.. _AUCTeX: http://www.gnu.org/software/auctex/
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.. _pip: https://pypi.python.org/pypi/pip