Mergence is a high performance, open source HL7integration engine and application platform. It was developed to fill the need for an open source, fully transactional healthcare integration system capable of handling millions of messages per day, and thousands of concurrent LLP connections.
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https://www.hmsinc.com/confluence/display/mergence/Home;jsessionid=EDB6F8E42BBFCAFF7BEF85ABC8382768
