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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.
OfflineIMAP has been ported to Python3: https://github.com/OfflineIMAP/offlineimap3
For details, see: https://github.com/OfflineIMAP/offlineimap/issues/670
I came across fdm, which is fast, lightweight, and simple to configure. It fetches mail. That's it. The config is literally a couple of lines for a single mailbox.
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Hence, a higher number means a more popular project.