Darkwallet is a bitcoin wallet designed to make bitcoin use completely private.
Stealth payments + CoinJoin mixing = Bitcoin Anonymity
Multisignature cooperative wallets
Darkwallet is now in its first public beta
You can download Darkwallet for your evaluation today.
Darkwallet is built using Libbitcoin
Libbitcoin is a multipurpose bitcoin library targeted towards high end use. The library places specific emphases on asychronicity, speed and availability.