datalog is just the query language. For me there's no such thing as a datalog db, there are various db that uses some derivative of datalog for querying but that's it. To give you an idea, datomic has other ways to query your data than with datalog alone.

The "closest" to datomic is datahike right now. Crux/datahike/datascript/asami all use datalog in some way or another but they cover different use cases.