Knockout is a standalone JavaScript implementation of the Model-View-ViewModel pattern with templates. Developed by Knockoutjs.com
License: Open Source
KnockoutJS is a lightweight JavaScript library primarily focused on MVVM and two-way data binding, making it easy to implement dynamic UIs. In contrast, Ember.js is a full-fledged framework that provides convention over configuration, strong routing, and performance optimizations, making it suitable for large-scale applications.