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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.
Terra is an extremely customisable terrain engine, which allows you to make your own terrain generators. It's very in depth, but does have a fairly large learning curve. I highly recommend you join the Discord and check out the GitHub for examples, however.
NOTE:
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Hence, a higher number means a more popular project.