Too Long; Didn't Read
Matlab, Excel, Tableau and The Natural Learning Toolkit are the most important data science tools. Matlab is used for fuzzy logic and neural networks. Tableau's core and strength lie with its ability to interface: database, analytical processing, and of course spreadsheet - but advanced. It's heavy and slippery, and it has a steep learning curve. The Natural Language Toolkit is not about visualization afterall. It can help computers understand human language; Thanks to machine learning and algorithms.