OpenEMR

http://www.open-emr.org/ OpenEMR is the most popular open source electronic health records and medical practice management solution. ONC certified with international usage, OpenEMR's goal is a superior alternative to its proprietary counterparts. With passionate volunteers and contributors dedicated to guarding OpenEMR's status as a free, open source software solution for medical practices with a commitment to openness, kindness and cooperation. http://www.open-emr.org/
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