Fly.js vs Grunt: What are the differences?
Fly.js: New generation build system. Fly is a modern build system for Node based in co-routines, generators and promises. Fly has robust error handling, callback heaven, cascading tasks, parallel execution and a simple API. See the documentation to learn more about how to use Fly and write your own plugins; Grunt: The JavaScript Task Runner. The less work you have to do when performing repetitive tasks like minification, compilation, unit testing, linting, etc, the easier your job becomes. After you've configured it, a task runner can do most of that mundane work for you—and your team—with basically zero effort.
Fly.js and Grunt belong to "JS Build Tools / JS Task Runners" category of the tech stack.
Grunt is an open source tool with 11.9K GitHub stars and 1.55K GitHub forks. Here's a link to Grunt's open source repository on GitHub.