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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.
I'll pretend you didn't mention "easiest" and retweet https://github.com/dickmao/gnus-imap-walkthrough, which I've been hawking for years. So far no takers, but I'm not giving up.
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.