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This is not a simple quest, and the question above rises more than reasonable doubt as to whether the idea is anywhere near ripe enough. I doubt that reasonable exchange software is anything different from a custom tailored solution, and not an out of the box or Github instance of some OpenSource project.
We’re talking about people’s investments here, where security, functionality, speed and robustness are paramount. Public scripts use to implement an instance of a p2p exchange software seems to me rather far from being reliable, even if there is any around. Not the best comparison (due to conceptual collision with crypto), but a bank does not really go to Github to create it’s frontend and backend core software.