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OpenPapyrus
Sophisticated ERP, CRM, Point-Of-Sale, etc. Open source now. This system is developed since 1996.
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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.
OpenPapyrus for free. https://github.com/papyrussolution/OpenPapyrus. There is payable support but it s not mandatory.
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.