| [pluggy](https://github.com/pytest-dev/pluggy) | Plugin and hook calling mechanisms for python. |
| [pudb](https://pypi.python.org/pypi/pudb) | PuDB is a full-screen, console-based visual debugger for Python. |
| [pybtex](https://pypi.python.org/pypi/pybtex) | A BibTeX-compatible bibliography processor in Python. |
| [PyDispatcher](https://pypi.python.org/pypi/PyDispatcher) | Multi-producer-multi-consumer signal dispatching mechanism. |
| [pymatgen](https://pypi.python.org/pypi/pymatgen) | Python Materials Genomics is a robust materials analysis code that defines core object representations for structures and molecules with support for many electronic structure codes. It is currently the core analysis code powering the Materials Project (https://www.materialsproject.org). |
| [pyparsing](http://pyparsing.wikispaces.com) | The pyparsing module provides a library of classes that client code uses to construct the grammar directly in Python code. |
| [pytest](http://pytest.org) | Simple powerful testing with Python |
...
...
@@ -404,6 +405,7 @@
| [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. |
| [sympy](http://sympy.org/) | SymPy is a Python library for symbolic mathematics. It aims to become a full-featured computer algebra system (CAS) while keeping the code as simple as possible in order to be comprehensible and easily extensible. SymPy is written entirely in Python and does not require any external libraries. |
| [tornado](https://pypi.python.org/pypi/tornado) | Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed. |
| [urllib3](https://pypi.python.org/pypi/urllib3) | HTTP library with thread-safe connection pooling, file post, and more. |