I nominate EffectsToCause from VeriCoin.info

The entire VeriCoin Team has been transparent from the start.

But what many don't know is that Doug (EffectsToCause) is the Dev who does the actual coding to the protocol while Pat works more with the network and super nodes. Dave did some work with the feature implementation.

Doug is a patent holding Biologist who works on coding for protein folding during his day job, has a family and yet stays up until 2AM every night working hard on writing code, debugging etc.

People don't really know this because he's not very outspoken and is extremely humble.

Other great Devs IMO - JL777, Syntaks and Rat4.