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Datomic Free gives you that capability right now, for free, no strings attached, and no need to use a Datomic db. Not open source, but free as in gratis, a la Creative Commons.

We may trim down the deps a bit for that use case.

A trimmed down version is great news. Datalog makes Clojure so much better! Ideally it would be part of Clojure itself, but I'll take what I can get :)

I would also love to see a trimmed down version just to use datalog.

The datomic-free jar provides Datalog. I use it myself https://clojars.org/com.datomic/datomic-free.

I'm working on a port of BloomL for clojure which will include a semi-naive datalog interpreter (it will already support naive, monotonic datalog by tonight). It will likely never be as well optimised as the Datomic libs but it is LGPL.

Source:

https://github.com/jamii/droplet

Background:

http://www.bloom-lang.net/

http://boom.cs.berkeley.edu/

http://db.cs.berkeley.edu/papers/UCB-lattice-tr.pdf