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https://github.com/mautic/mautic is one open source entry. It's pretty robust (full disclosure, I haven't used it in 3+ years). It's a php app that runs independently of your application and has an embeddable js that makes the connection (a lot like google analytics, etc).
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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Just a hint regarding sending mail with JS, I’ve recently come across https://github.com/sofn-xyz/mailing. I am yet to use it, but it looks wonderful. Might help you develop, if you know React.
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.
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Mautic 4.4.3 released!
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