Backbone.js is a JavaScript framework with a RESTful JSON interface and is based on the model–view–presenter (MVP) application design. Developed by Jeremy Ashkenas
License: Open Source
React is a modern library focused on building user interfaces with a component-based architecture and virtual DOM, while Backbone.js is a lightweight framework that provides structure to web applications but is more minimalistic. React's ecosystem is richer and more robust compared to Backbone.js, which is simpler and easier to integrate into existing projects.