Ember.js is an open-source JS framework tool that was initially released in December 2011 under an MIT License license by Ember Core Team. This framework library is used by tech companies that include Netflix, Intercom, Microsoft, Square, Crowdstrike, Apple, LinkedIn, and Heroku.
Backbone.js is more suited to web application pages providing models, collections, and views. It allows connecting of an API over a RESTful JSON interface.
Svelte does differently from the traditional frameworks in building user interfaces. It updates the Document Object Model(DOM) when the state of the app changes instead of depending on the virtual DOM technique.