As of existing solutions, for now, I am aware only of these two. But at least one similar solution is in the making - the ethereum-based Maker DAO with the Dai stablecoin, that seems to work pretty similar to the BitUSD.

There is also SuperNet's PAX, another solution in development, although I don't know if it's not vaporware. It works a bit different than BitShares, but their "USD+", as far as I understand it, could be classified as a smartcoin.