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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't plot implicit graph yet, but that's in numworks mind (see the link). Currently, the only solution you have is to convert it to parametric, and change the setting of the function.
NOTE:
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Hence, a higher number means a more popular project.