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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.
If by Orion you mean Master of Orion, then Remnants of the Precursors is the free modern Java remake of it. And here is a good AI mod for it.
There's a far, far older abandoned opensmac project from 8 years ago, hacked together in Python 2.7. Probably no more than someone's "got started on it" effort, but haven't evaluated.
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.