There was one called Intersago but it looks defunct: http://bitcoin.stackexchange.com/questions/1447/is-there-an-open-source-bitcoin-exchange http://bitcoin.sta

There was one called Intersago but it looks defunct: http://bitcoin.stackexchange.com/questions/1447/is-there-an-open-source-bitcoin-exchange http://bitcoin.stackexchange.com/questions/1447/is-there-an-... I came across this project on bitcointalk, which isn't really an exchange but looks interesting: https://github.com/FellowTraveler/Open-Transactions https://github.com/FellowTraveler/Open-Transactions