Flex SDK is Free & Open Source but Flex Builder is neither free nor open source.
I googled if there is any way to use Flex SDK with Eclipse (because Flex Builder is built on Eclipse too) for development purpose.I found 2 useful results; Of course I haven’t tried yet.
http://cfsilence.com/blog/client/index.cfm/2007/3/26/Setting-Up-Eclipse-For-Flex-2
http://www.darronschall.com/weblog/archives/000182.cfm
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