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Having programmed with extjs for 5 years my experience is that it is extremely popular in the corporate space, but never caught on in the open source space due to licensing. There are still many more corporate developers than open source developers, but they are far less vocal.

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I heared they switched from LGPL to GPL suddently, which filled the devs with fear, I guess :\

But yes, I use it for corporate software, since my company pays the license. Also it's strong in the table and charting parts, which are the butter and bread of many corporate devs.

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