Equivalent of Akka but for .NET (Concurrency Framework)

Question

Is there something equivalent of Akka but for .NET?

http://doc.akka.io/use-cases

Answer 1

This is an (/my) ongoing port of Akka actors for .NET [EDIT] The project have evolved into a direct port of real Akka: https://github.com/akkadotnet

It is in large a class by class, line by line port.