Duo

npm is the command-line interface to the npm ecosystem. It is battle-tested, surprisingly flexible, and used by hundreds of thousands of JavaScript developers every day.

Yarn caches every package it downloads so it never needs to again. It also parallelizes operations to maximize resource utilization so install times are faster than ever.

RequireJS loads plain JavaScript files as well as more defined modules. It is optimized for in-browser use, including in a Web Worker, but it can be used in other JavaScript environments, like Rhino and Node. It implements the Asynchronous Module API. Using a modular script loader like RequireJS will improve the speed and quality of your code.

Browserify lets you require('modules') in the browser by bundling up all of your dependencies.

It provides a consistent environment for Ruby projects by tracking and installing the exact gems and versions that are needed. It is an exit from dependency hell, and ensures that the gems you need are present in development, staging, and production.

It is the package installer for Python. You can use pip to install packages from the Python Package Index and other indexes.

Component's philosophy is the UNIX philosophy of the web - to create a platform for small, reusable components that consist of JS, CSS, HTML, images, fonts, etc. With its well-defined specs, using Component means not worrying about most frontend problems such as package management, publishing components to a registry, or creating a custom build process for every single app.

A simple, zero-config-required local private npm registry. Comes out of the box with its own tiny database, and the ability to proxy other registries (eg. npmjs.org), caching the downloaded modules along the way.

Browsers don't have the require method defined, but Node.js does. With Browserify you can write code that uses require in the same way that you would use it in Node.

It is a new kind of package registry for the modern web. It handles formatting, configuring, building and publishing every package on the registry, so that individual authors don't have to.

It is a new package registry with a new CLI, designed to be easy to stand up inside your network. It features an entirely new file-centric API and a content-addressable storage system that attempts to minimize the amount of data you must retrieve over a network. This file-centric approach also applies to the publication API.

To allow people to control the development, funding and support of the registry itself, by making it fully open-source and transparent for its user and the public