Few weeks ago Balthazar have published a simple client implementation of Stratum protocol.

https://github.com/CryptoManiac/StratumLibrary

Currently working on pure C# implementation of basic NVC protocol features.

https://github.com/CryptoManiac/NovacoinLibrary

While libraries are far from being complete, this code already may be useful for block or transaction parsing, generation of addresses etc. The goal is to implement a minimum which is required to create our own implementation of Electrum client.