docopt : Command-line interface description language
NLTK : The Natural Language Toolkit (NLTK) is a Python package for natural language processing.
It provides easy-to-use interfaces to over 50 corpora and lex...
Essentia : Open-source library and tools for audio and music analysis, description and synthesis
TextBlob : TextBlob is a Python (2 and 3) library for processing textual data. It provides a simple API for diving into common natural language processing (NLP) ...
sh (previously pbs) is a full-fledged subprocess interface for Python that allows you to call any program as if it were a function