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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.
Check out FoxBMS if you want an open source BMS... it is developed in Germany and looks very capable, plus you can modify it if you want to make something specific to a module you are using. (https://github.com/foxBMS/foxbms-2)
NOTE:
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Hence, a higher number means a more popular project.