I would like to know if anyone has experience or great knowledge about the JavaScript ExtJS framework or some equivalent.
The goal is to know if it is recommended (recommended = best option) for sites (large sites such as virtual stores and portals, for example) and also for the development of a medium / large size system. >
The goal is to use FREE tools, since the language to be used will be PHP.
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Specifying the question:
Besides AngularJS and Jquery, where these are among the most used, I would like to experiment with other good alternatives to use besides these. At first ExtJS had called my attention, so I quoted him in the question.
The goal is to acquire the knowledge of good alternatives either for the development of the system (back-end) or for the part of the site itself (front-end).
Thank you for the answers!