Ask HN: Are there any free, worldwide electronic medical records (EMR)?

I think the OP means EMR/EHR software. Wikipedia has a pretty comprehensive list at http://en.wikipedia.org/wiki/List_of_open-source_healthcare_...

I am in the health IT space and VistA (http://www.ehealth.va.gov/VistA.asp) is likely the most widely used in terms of patients stored. I hear http://www.open-emr.org/ is the most developer friendly.