| [attrs](http://www.attrs.org/) | Classes Without Boilerplate |
| [backports_abc](https://pypi.python.org/pypi/backports_abc) | A backport of recent additions to the "collections.abc" module. |
| [bcrypt](https://pypi.python.org/pypi/bcrypt) | Modern password hashing for your software and your servers |
| [Biopython](http://www.biopython.org) | Biopython is a set of freely available tools for biological computation written in Python by an international team of developers. It is a distributed collaborative effort to develop Python libraries and applications which address the needs of current and future work in bioinformatics. |
| [bleach](https://pypi.python.org/pypi/bleach) | An easy safelist-based HTML-sanitizing tool. |
| [BoltzTraP2](https://www.imc.tuwien.ac.at/index.php?id=21094) | BoltzTraP2 is a modern implementation of the smoothed Fourier interpolation algorithm for electronic bands that formed the base of the original and widely used BoltzTraP code. |
| [certifi](https://pypi.python.org/pypi/certifi) | Python package for providing Mozillas CA Bundle. |