BitcoinX. It's a fork of Bitcoin that moves it from the POW mining chain to the DPOS Graphene chain. So BitcoinX works just like Steem or Bitshares, 3s transfers, 10,000-100,000 transactions per second, send bitcoin to accounts instead of hash addresses etc. BTCX basically fixes everything that is wrong with BTC all at once, no more forking/miner/developer drama. All the scaling is done, fast tx are done.