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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.
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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.
iRedMail. Free to use and basically trouble-free for me after some initial issues got worked out on my config.
Mailinabox https://mailinabox.email/. All you need is a VPS with a clean IP, took me 3 tries to get one that wasn't blacklisted on any list per mxtoolbox.com. I've been using it for 4 years now and have only had an issue receiving an email once.
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.