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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.
Not sure what you're on about with OpenIV, but CodeWalker is an open source mod that can do just about everything OIV can.
MenyooSP is also open source and does still get basic compatibility updates.
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.