Nearest one :
http://bitcoin-analytics.com/https://github.com/maxme/bitcoin-arbitragebitcoin-arbitrage - opportunity detector and automated trading
It gets order books from supported exchanges and calculate arbitrage opportunities between each markets. It takes market depth into account.
Currently supported exchanges to get data:
MtGox (USD, EUR)
Bitstamp (USD, ~EUR)
Bitcoin24 (EUR)
Bitfloor (USD)
Bitcoin-Central (EUR)
BTC-e (USD, EUR)
Intersango (EUR)
Bitfinex (USD)
Kraken (USD, EUR)
Bitcoin-Central (EUR)
Currently supported exchanges to automate trade:
MtGox (EUR, USD)
Bitstamp (USD)
Bitcoin-Central (EUR) - (API changed)
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But consider it's not updated from a long time....