I found BlinkTrade, which seems work only with BlinkTrade API. https://blinktrade.com/
Peatio seems very hard to integration and outdated. https://github.com/peatio/peatio
Coinffeine, I am not checked this deeply. http://www.coinffeine.com/
ViaBTC have open the server, but not full code. https://github.com/viabtc/viabtc_exchange_server
Seems there is out some system, which are using many exchanges - like Bittrex, etc. Many seems very similiar. Can you maybe mention some exchange source, which you think is preatty good. I can pay for code as well with reasonable price.
Peatio has been forked now, you will get your answer here https://github.com/rubykube