Just wondering what is the cost of building RIA using Flex for Business organization? With Cost, i am not including Skills, but S/W H/W and licensing n all. Flex is open source. My org has licensed CF 7 server. If i build an application using flex SDK only, am I violating any licensing term? I guess, the only cost is to have Flash Builder as Adobe Flash Player is also free. Flex applications are essentially Flash applications (or need AIR for desktop apps, which is free as well).