npm - npm is a package manager for Node.
JSPM - Front End Package Manager, Frontend Development, and Javascript
Webpack - Webpack is a module bundler. Its main purpose is to bundle JavaScript files for usage in a browser, yet it is also capable of transforming, bundling, or packaging just about any resource or asset.
Brunch - Brunch builds, lints, compiles, concatenates and shrinks your HTML5 app in an ultra-simple way. No more Grunt / Gulp mess.
RequireJS - RequireJS is a JavaScript file and module loader.
Numericalunits - A package that lets you define quantities with units, which can then be used in almost any numerical calculation in any programming language.