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there’s also datahike https://github.com/replikativ/datahike

Seeing as Amazon are now Embrace, Extend, Extinguishing profitable open-source service providers that are the primary contributors to the projects, I think it's a good thing Datomic isn't open source, and that it's worth paying $30/mo for.

This looks promising https://juxt.pro/crux/index.html

datalog, high performance, flexible deployment options, open source. especially interesting for us because you can actually remove data for gdpr/compliance reasons. Datomic has a lot of trouble with that in our experience

It does look cool. Is anyone out there using it in production?

I'm guessing the creators solved a real business need and decided to go open source. Really nice folks btw. Props to juxt.

There's an on-premise version of Datomic as well.