Polymer lets you build encapsulated, reusable elements that work just like standard HTML elements, to use in building web applications. Developed by Polymer Authors
License: Open Source
Polymer focuses on web components and offers a lightweight framework with a rich set of built-in features, while Aurelia provides a more conventional approach to MVVM architecture with a solid two-way data binding system. Both frameworks are well-suited for modern web applications but cater to different development styles.