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OpenAMF
OpenAMF is an open-source Java library for Flash Remoting which was used extensively to get AMF.NET up and running.
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AMFPHP
AMFPHP is an open-source PHP library for Flash Remoting. It too was used occasionally to solve the mysterious binary stream.
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Fuel Industries
Market leader in advergaming and flash-based development. This also happens to be the company I work for :)