Data Science Toolkit : A collection of the best open data sets and open-source tools for data science, wrapped in an easy-to-use REST/JSON API with command line, Python and ...
Babel : Babel will turn your ES6+ code into ES5 friendly code, so you can start using it right now without waiting for browser support.
PurgeCSS : PurgeCSS is a tool to remove unused CSS. It can be part of your development workflow.
ESLint : The pluggable linting utility for JavaScript and JSX
Grunt is a task-based command line build tool for JavaScript projects
