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Pimcore
Core Framework for the Open Source Data & Experience Management Platform (PIM, MDM, CDP, DAM, DXP/CMS & Digital Commerce)
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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.
In this case, Pimcore appears to be free software, as it is offered under the GPLv3. https://github.com/pimcore/pimcore
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.