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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.
You can download it from here. If you're using mac, you just use this as well! If for some reason that doesn't work, you can absolutely contact them and they will give you a functioning link, especially if you still have that email!
NOTE:
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Hence, a higher number means a more popular project.