Yeoman EE Add-on Generator
Yeoman is a web app development workflow that makes it easy to generate scaffolds for dozens of web development technologies.
Rob Sanchez made a Yeoman generator for ExpressionEngine add-ons (a fork of one created for modules) that makes it easy to spin up a new add-on package by just answering some questions.
All it takes is running:
yo ee-addon
to generate a new add-on shell.