Ember.js

Ember.js is an open-source JavaScript framework for building modern web applications that work across devices. It addresses the need for a structured, scalable UI architecture by providing an integrated set of tools rather than requiring developers to assemble a framework from separate pieces. The framework supports routing, data access, testing, and a build pipeline, and it is designed for teams that maintain applications over long periods.

Core capabilities include Ember CLI for code generation, development, and production builds; a built-in router with async data loading and nested URLs; Ember Data for accessing multiple data sources and managing asynchronous relationships; and a default test harness that generates tests alongside entities and runs them in the browser. Ember is built on the Glimmer rendering engine and follows a six-week release cycle with deprecation warnings and codemods to support upgrades. The ecosystem includes Ember Addons, Ember Concurrency for state management, and Ember Observer for evaluating addon quality. TypeScript is supported, and the framework works with modern JavaScript features.

Ember.js is aimed at JavaScript developers and teams building rich, long-lived web applications. The pages do not describe paid editions, seat-based licensing, or usage-based pricing; the framework and its documentation are available for download and use.