Hacker News Reader

I've been keeping an eye on https://github.com/cozodb/cozo which is pretty close to something I've wanted, a sqlite version of datalog/datomic.

Datahike [0] provides similar functionality to datomic and is open source. It lacks some features however that Datomic does have [1].

There's XTDB which is still Clojure-centric but is at least open-source. It supports SQL queries.