Ext JS is described as 'JavaScript library for building interactive web applications using techniques such as Ajax, DHTML and DOM scripting. Ext includes interoperability with jQuery and Prototype' and is a javascript framework in the development category. There are more than 25 alternatives to Ext JS, not only websites but also apps for a variety of platforms, including Self-Hosted, Windows, Linux and Mac apps. The best Ext JS alternative is Vue.js, which is both free and Open Source. Other great sites and apps similar to Ext JS are Angular, React, Svelte and Vite.
jQuery UI is an open source library of interface components — interactions, full-featured widgets, and animation effects — based on the stellar jQuery javascript library . Each component is built according to jQuery's event-driven architecture (find something, manipulate...
Zepto is a minimalist JavaScript library for modern browsers with a largely jQuery-compatible API.
Dojo Toolkit is an open source modular JavaScript library (or more specifically JavaScript toolkit) designed to ease the rapid development of cross-platform, JavaScript/Ajax-based applications and web sites.
JavaScript Library / HTML5 UI framework for developers with SpreadSheet, Pivot, Kanban, FileManager, Scheduler, Datatable, TreeTable and etc. widgets.
Elm aims to make web development more pleasant. Elm is a type-safe, functional reactive language that compiles to HTML, CSS, and JavaScript.
A toolchain for building reusable, scalable Design Systems. Generate small, blazing fast, and 100% standards based Web Components that run in every browser.
Prototype is a JavaScript Framework that aims to ease development of dynamic web applications. Prototype provides various functions for developing JavaScript applications. The features range from programming shortcuts to major functions for dealing with XMLHttpRequest.
Mithril is a modern client-side Javascript framework for building Single Page Applications. It's small (< 8kb gzip), fast and provides routing and XHR utilities out of the box.
Enact is an app development framework built atop React that’s easy to use, performant and customizable.
Kendo UI is JQuery-based framework for rich UI, build HTML5 apps that look native on any device, build desktop and mobile applications for any browser.
Gem.js gives you a way to create modular, composable web components and modular, composable styles in pure-javascript. It also includes a set of extensible web components for building visual user interfaces and styling web applications.
AlloyUI is a framework built on top of YUI3 (JavaScript) that uses Bootstrap (HTML/CSS) to provide a simple API for building high scalable applications.
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Zepto doesn't provide a UI toolkit.