Well some brokers in India use such software for commodity futures spread trading but they are developed by thier own team of software techies and they just dont sell it (obviously, why should they)... even I am looking for the one... but remem' the software is a software which can't smell politics, economic conditions and disasters...
It just look for a spread and buy on the market price, what if the spread further widens up more and doesnt come in range untill expiry... ?
"A market analyst is an expert who will know tomorrow why the things he predicted yesterday didn't happen today!"