PMCID: PMC5346165: The State of Open Source Electronic Health Record Projects: A Software Anthropology Study
OpenEMR included in the study.
Wrote the the author about the certification status of OpenEMR.
nice article (a bit outdated; I am pretty sure OpenEMR is the only open source project with MU2).
OpenEMR was reported as getting the most downloads 
-brady
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Interesting article indeed. Though it would be nice to know how many physician practices actually use OpenEMR.