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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.
In my experience mbsync is best if using IMAP as it works well with very large IMAP folders. If you happen to be on Gmail and Notmuch then Gmailieer is worth checking out as it provides full two-way label/tag sync between the two.
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.