Actually, Darksend for darkcoin works. It works only with denominatins of 10drk or less. It is proven to be obscured, but not 100% anonymous. No coin is presently. VRC, for all their hard work, are not in the anon game. Yes, they have verisend, but it is centalized and not trustless. The devs have said that they don't want to focus currently on anon as they don't believe it makes vrc marketable. (Paraphrased loosely, not fud). Yes, Cloak is working as well, but there is a reason why dark is where it is. XC is interesting. Not sure if the dev can pull it off, but we shall see.
http://www.coinjoinsudoku.com/Coinjoin is obsolete very soon.. not good news for Darkcoin.
Initial commit 22 days ago, and there is nothing but text files, no other update, i doubt that the tool is still under construction by this dev. It's been probably cracked already, but the solution hasn't been made publicly available - just my opinion.