Yarn : Fast, reliable, and secure dependency management tool for javascript.
Snyk : Snyk helps you use open source and stay secure.
Continuously find & fix vulnerabilities in your dependencies.
Flow : Adds static typing to JavaScript to improve developer productivity and code quality.
ESLint : The pluggable linting utility for JavaScript and JSX
DOM Monster Bookmarklet : DOM Monster is a cross-platform, cross-browser bookmarklet that will analyze the DOM & other features of the page you're on, and give you its bill of ...
A tool for managing JavaScript projects with multiple packages.