Knockout is a standalone JavaScript implementation of the Model-View-ViewModel pattern with templates. Developed by Knockoutjs.com
License: Open Source
Derby is a lightweight framework focused on real-time applications with two-way data binding, making it suitable for projects that require quick integration and strong performance. In contrast, KnockoutJS offers a more declarative approach to UI development with robust community support and a rich ecosystem, though it may present a steeper learning curve for newcomers.