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openemr
The most popular open source electronic health records and medical practice management solution.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Here is OpenEMRs github page. The project is coded predominantly in PHP and the project seems to be very active when you look at the rate of code merges.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.