Look at Jam package manager. Following is the description from its homepage
For front-end developers who crave maintainable assets, Jam is a package manager for JavaScript. Unlike other repositories, we put the browser first.
It seems a lot similar to npm in how it works.
Install package like below
jam install backbone
keeping packages up to date by executing
jam upgrade
jam upgrade {package}
Optimize packages for production
jam compile compiled.min.js
Jam dependencies can be added in package.json file.
For complete documentation read Jam Documentation
