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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 suspect your new mail server supports IMAP. So you can run offlineimap to "sync" mails from Proton Mail to your server, as long as you have Proton Mail Bridge available.
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.