Open Source Flashcom server – RED5, recent version starts supporting AMF0 and AMF3 protocols. This is an amazing feature with RED5 server, when people are looking for free Open Source based AMF3 Remoting.
RemoteObject object can be used to connect AMF3 gateway while building application with Flex 2, 3 and on AIR based applications. NetConnection object can be used to connect AMF3 from Flash CS3 by setting the ObjectEncoding property to AMF3. Changing the ObjectEncoding property to AMF3, you can test Oscartrelles AS3 Flash Remoting Example with Flash CS3.