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This question already has an answer here:

Is it any open source Bitcoin exchange code is available

marked as duplicate by Colin Dean, cdecker, Salvador Dali, Loourr, Murch Jan 30 '14 at 16:06

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Justcoin uses snow which is open sorce. I don't know if you are asking about Justcoin or Snow, either way, any of those two should be the answer to your question.

0

openex is another open source exchange but the trade engine is not free and you should pay for that. Can be found on https://github.com/r3wt/openex

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