Also I am not sure how this[1] fits in. I remember Paul Bohm being the founder or co-founder of Buttercoin, but his name is absent.
Unfortunately things didn't work out and the original open source effort died off when we decided to start with a fresh implementation. We just recently release the engine we're using (with some minor tweaks) under an MIT license here: https://github.com/buttercoin/engine. We'll be backporting a bit more functionality until we can actually run it in production.