
React is the most popular Web-based, Windows, Mac & Linux alternative to SmartClient.
React is the most popular Open Source & free alternative to SmartClient.
- React is Free and Open Source
- React is Customizable
SmartClient is described as 'A web application framework for building high-performance, data-driven enterprise applications with rich UI components and built-in data management' and is an website in the development category. There are 2 alternatives to SmartClient, not only websites but also apps for Mac, Windows and Linux. The best SmartClient alternative is React, which is both free and Open Source.

React is the most popular Web-based, Windows, Mac & Linux alternative to SmartClient.
React is the most popular Open Source & free alternative to SmartClient.
Ext JS is a JavaScript library for building interactive web applications using techniques such as Ajax, DHTML and DOM scripting. Ext includes interoperability with jQuery and Prototype.
Ext JS is the most popular commercial alternative to SmartClient.