A lot of people hate anything Flash but Adobe Flex was a really great tool to create web apps at one time (before the spark components). It introduced a lot of cool things for making web apps like two way data-bindings, asynchronous requests, event listeners at core of everything, MXML components with repeaters, etc - many of these things that AngularJS does now with Javascript.<p>If their browser plugin wasn&#x27;t so buggy and non-standard it could have been a really good alternative.