Ember.js

Ember.js is a productive, battle-tested JavaScript framework for building modern web applications. It includes everything you need to build rich UIs that work on any device, designed with developer ergonomics and productivity in mind. Its "batteries-included" philosophy means you get a complete front-end stack out of the box, allowing you to focus on building features, not wiring tools together.

Key features include:

• A powerful CLI: The Ember CLI provides code generators, a built-in development environment with fast rebuilds, auto-reload, and a test runner.
• Best-in-class routing: A built-in router that handles async data loading, dynamic URL segments, and nested routes seamlessly.
• Integrated data layer: Ember Data is included to access data from multiple sources, manage asynchronous relationships, and keep models up-to-date.
• Built-in testing: A modern test harness is included by default, with support for unit, integration, and acceptance tests.
• High performance: Built on the Glimmer rendering engine, it delivers fast rendering with performance upgrades often included in version updates.