There is Datascript. I am not a Clojure guy, so it is not clear to me if it pulls datomic as a dependency.
Datascript is very similar to Datomic, except that it runs in ClojureScript and is an in-memory datastore with no concept of history or point-in-time queries. The schemas are also much looser than Datomic.
Otherwise, many syntax and semantics are similar.
No dependency on Datomic as Datomic is Java and DataScript is JavaScript.
It is not Datalog syntax but heavily inspired by Datalog.
I'm throwing this in here just for clarification, I don't want to see Datomic as collateral damage in this conversation.