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Flash Player 9 (free)
Flex 2 applications (SWF) run within the Flash 9 Player.
Flex 2 SDK (free)
Enables you to develop and deploy Flex applications for free using an IDE of your choice. Includes the Flex framework, the compiler, and the debugge
J. Böhringer, P. Bühler, and P. Schlaich. X.Media.Press Springer, Berlin ; Heidelberg, 5., vollständig überarbeitete u. erweiterte Aufl. edition, (2011)