docopt : Command-line interface description language. docopt helps you define interface for your command-line app, and automatically generate parser for it.
cliff : Command Line Interface Formulation Framework. cliff is a framework for building command line programs. It uses plugins to define sub-commands, output ...
Essentia : Open-source library and tools for audio and music analysis, description and synthesis
readability-lxml : In few words, Given a html document, it pulls out the main body text and cleans it up. It also can clean up title based on latest readability.js code.
Harpoon : CLI tool for open source and threat intelligence. Harpoon is a tool to automate threat intelligence and open source intelligence tasks. It is written ...
Clint is a python module filled with a set of awesome tools for developing commandline applications.