- [Lo-Dash](http://lodash.com) - A utility library delivering consistency, customization, performance, & extras. A better and faster Underscore.js.
- [Underscore.js](http://underscorejs.org) - Provides a whole mess of useful functional programming helpers without extending any built-in objects.
- [Mout](http://moutjs.com) - Utility library with the biggest difference between other existing solutions is that you can choose to load only the modules/functions that you need, no extra overhead.
### Command-line apps
- [npm](https://github.com/npm/npm/) - A package-manager for Node.js.
- [Bower](http://bower.io) - A package manager for the web.
- [Yo](https://github.com/yeoman/yo) - Run Yeoman generators.
- [winston](https://github.com/flatiron/winston) - A multi-transport async logging library.
- [Bunyan](https://github.com/trentm/node-bunyan) - A simple and fast JSON logging library.
### Web frameworks
- [Koa](http://koajs.com) - A new web framework designed by the team behind Express, which aims to be a smaller, more expressive, and more robust foundation for web applications and APIs.
- [Express](http://expressjs.com) - A minimal and flexible web application framework, providing a robust set of features for building single and multi-page, and hybrid web applications.
- [configstore](https://github.com/yeoman/configstore) - Easily load and persist config without having to think about where and how.
- [insight](https://github.com/yeoman/insight) - Helps you understand how your tool is being used by anonymously reporting usage metrics to Google Analytics.
- [gulp.js](http://gulpjs.com) - Streaming and fast build system that favors code over config.
- [grunt](http://gruntjs.com) - Task runner that can perform repetitive tasks like minification, compilation, unit testing, linting, etc.
- [Broccoli](https://github.com/broccolijs/broccoli) - A fast, reliable asset pipeline, supporting constant-time rebuilds and compact build definitions.
### Templating
- [handlebars.js](https://github.com/wycats/handlebars.js/) - Provides the power necessary to let you build semantic templates effectively with no frustration.
- [Jade](https://github.com/visionmedia/jade) - High performance template engine heavily influenced by Haml.
- [nunjucks](https://github.com/mozilla/nunjucks) - A powerful templating engine with inheritance, asynchronous control, and more (jinja2 inspired).
### Documentation
- [Docco](http://jashkenas.github.io/docco/) - A quick-and-dirty documentation generator which produces an HTML document that displays your comments intermingled with your code.
- [JSDoc](http://usejsdoc.org) - API documentation generator similar to JavaDoc or PHPDoc.
- [dox](https://github.com/visionmedia/dox) - JavaScript documentation generator for Node.js using Markdown and JSDoc.
- [each-async](https://github.com/sindresorhus/each-async) - Async concurrent iterator like forEach.
- [async](https://github.com/caolan/async) - Provides straight-forward, powerful functions for working with asynchronousity.
- [co](https://github.com/visionmedia/co) - The ultimate generator based flow-control goodness.
- [Highland.js](http://highlandjs.org) - Manages synchronous and asynchronous code easily, using nothing more than standard JavaScript and Node-like Streams.
- [native-promise-only](https://www.npmjs.org/package/native-promise-only) - A polyfill for native ES6 Promises.
- [Bluebird](https://github.com/petkaantonov/bluebird) - A fully featured promise library with focus on innovative features and performance.
- [Q](https://github.com/kriskowal/q) - A tool for making and composing asynchronous promises.
### Streams
- [through2](https://github.com/rvagg/through2) - Tiny wrapper around Node streams2 Transform to avoid explicit subclassing noise.
- [concat-stream](https://github.com/maxogden/concat-stream) - Concatenates a stream into strings or binary data.
- [simple-bufferstream](https://github.com/rvagg/node-simple-bufferstream) - Turn a Buffer into a ReadableStream.
- [Metalsmith](http://www.metalsmith.io) - An extremely simple, pluggable static site generator.
- [Wintersmith](http://wintersmith.io) - Flexible, minimalistic, multi-platform static site generator.
- [Assemble](http://assemble.io) - Static site generator for Node.js, Grunt.js, and Yeoman.
### Content management systems
- [KeystoneJS](http://keystonejs.com) - CMS and web application platform built on Express and MongoDB.
- [Calipso](http://calip.so) - A simple content management system, built along similar themes to Drupal and Wordpress, that is designed to be fast, flexible and simple.
- [node-inspector](https://github.com/node-inspector/node-inspector) - Debugger based on Blink Developer Tools.
- [Theseus](https://github.com/adobe-research/theseus) - A new type of JavaScript debugger featuring real-time code coverage, retroactive inspection and asynchronous call tree.
- [longjohn](https://github.com/mattinsler/longjohn) - Long stack traces with configurable call trace length.
- [Professional Node.js: Building Javascript Based Scalable Software](http://www.amazon.com/Professional-Node-js-Building-Javascript-Scalable-ebook/dp/B009L7QETY/)
- [HowToNode](http://howtonode.org) - Teaching how to do various tasks in Node.js as well as teach fundamental concepts that are needed to write effective code.
- [GitHub Linker](https://chrome.google.com/webstore/detail/github-linker/jlmafbaeoofdegohdhinkhilhclaklkp) - Chrome extension that linkifies dependencies in package.json on GitHub.
