Emotiv Engine Client Library is posted at CodePlex
You may recall this code library from such blog posts as:
With this API, you can collect realtime neurodata from the EPOC headset in a managed application. The API simplifies databinding by exposing EmoEngine methods as CLR properties. Also, it provides a PropertyChanged event that notifies your code when new neurodata and other signals arrive. You also get a lightweight WPF visualization library that renders neurodata in realtime.