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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.
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Mail-in-a-Box
Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.
I use mailu.io
I've used Mailcow for years. No problems at all.
If you are on Linux + Ubuntu 18 you should try https://mailinabox.email/. Be sure to study the limitations. It's not yet ready for Ubuntu 20. It's prudent to keep mail server separate from your website server.
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.