FluorineFx
FluorineFx provides an implementation of Flex/Flash Remoting, Flex Data Services and real-time messaging functionality for the .NET framework.
Features
Flex, Flash Remoting (RPC), Flex AMF Polling
Flex Messaging
Flex Data Services (partial)
Supports AMF0, AMF3 and RTMP, RTMPT protocols
Service Browser
Template based code generator (ASP.NET like syntax)
Real-time Messaging, Remote SharedObject support, Video streaming
MSMQ integration
Easily integrate rich Internet applications with .NET backend
Easily integrate with Adobe Integrated Runtime (Adobe AIR™)
Ajax Integration
.NET and Silverlight client library
.NET frameworks supported by FluorineFx
Microsoft .NET Framework 1.1 (1.1.4322)
Microsoft .NET Framework 2.0 (2.0.50727)
Microsoft .NET Framework 3.5 (3.5.21022.8)
Mono 1.2.4
.NET frameworks support backward compatibility, that is a new version of the framework will run binary assemblies that were targeted to previous versions of the framework
The FluorineFx blog