| [PyYAML](https://pypi.python.org/pypi/PyYAML/) | PyYAML is a YAML parser and emitter for the Python programming language. |
| [scipy](https://github.com/jupyter/testpath) | Test utilities for code working with files and commands |
| [SCons](http://www.scons.org/) | SCons is a software construction tool. |
| [singledispatch](https://pypi.python.org/pypi/singledispatch) | A small but fast and easy to use stand-alone template engine written in pure python. |
| [six](https://github.com/benjaminp/six) | Python 2 and 3 compatibility library. |
| [spglib-python](https://pypi.python.org/pypi/spglib) | Spglib for Python. Spglib is a library for finding and handling crystal symmetries written in C. |
| [Werkzeug](https://pypi.python.org/pypi/Werkzeug) | The comprehensive WSGI web application library. |