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Flex

Flex was formerly known as Adobe Flex and is a highly productive, free open source framework for the development of rich applications for web, mobile and desktop environments. It’s an extension of Flash Player and can generate SWF files that are typically used on websites to display multimedia content or interactive interfaces. Using MXML, an XML-based markup language, along with ActionScript (an ECMAScript-based scripting language), developers can create animated user interfaces more easily than by writing code in Flash directly. With its ability to handle complex data structures asynchronously thanks to AMF (Action Message Format), it remains a niche tool due to the decline of Flash technology after being phased out from mainstream browsers at the end of 2020.

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