AngularJS lets you write client-side web applications as if you had a smarter browser. It lets use good old HTML (or HAML, Jade and friends!) as your template language and lets you extend HTML’s syntax to express your application’s components clearly and succinctly
Intuitive, fast & composable MVVM for building interactive interfaces.
The most advanced responsive front-end framework in the world. Quickly create prototypes and production code for sites and apps that work on any kind of device.
Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jade, coffee, css, less, ... and your custom stuff.
Promise based HTTP client for the browser and node.js
An alternative to Underscore.js, delivering consistency, customization, performance, and extra features.
Give your JS App some Backbone with Models, Views, Collections, and Events
Async utilities for node and the browser
Sentry is a realtime error logging and aggregation platform