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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.
That said, you could get going for zero dollars. Use your existing cheap joystick and pick up the awesome, free A-4E-C mod, which is an excellent Cold War jet. It'll be a lot more fun with all the expensive stuff I just mentioned, but you could begin tonight, for free, with a bit of downloading.
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.