| [PostgreSQL](http://www.mysql.com/) | PostgreSQL is a powerful, open source object-relational database system. It is fully ACID compliant, has full support for foreign keys, joins, views, triggers, and stored procedures (in multiple languages). It includes most SQL:2008 data types, including INTEGER, NUMERIC, BOOLEAN, CHAR, VARCHAR, DATE, INTERVAL, and TIMESTAMP. It also supports storage of binary large objects, including pictures, sounds, or video. It has native programming interfaces for C/C++, Java, .Net, Perl, Python, Ruby, Tcl, ODBC, among others, and exceptional documentation. |
| [redis](https://redis.io) | Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache and message broker. |
| [scikit-learn](http://scikit-learn.org/stable/index.html) | Scikit-learn integrates machine learning algorithms in the tightly-knit scientific Python world, building upon numpy, scipy, and matplotlib. As a machine-learning module, it provides versatile tools for data mining and analysis in any field of science and engineering. It strives to be simple and efficient, accessible to everybody, and reusable in various contexts. |
| [SoX](http://http://sox.sourceforge.net/) | Sound eXchange, the Swiss Army knife of audio manipulation |
| [XML-Parser](http://search.cpan.org/~toddr/XML-Parser-2.41/) | This is a Perl extension interface to James Clark's XML parser, expat. |
