oclif
Node.js Open CLI Framework. Built by Salesforce.
... to use or modify. We think you’ll love it too and you can also help make it better. You or your users can easily extend your CLI functionality to meet customer needs using plugins. Plugins are modular and shareable, encouraging reuse. oclif is actively used to build the Heroku and Salesforce CLIs, powering millions of interactions for developers every day. With oclif you can build command-line tools for your business, open-source project, or your own development workflow.