I work on Crux [0], which is also a Java-friendly Datalog database. It sits on top of lazy EAV indexes in RocksDB/LMDB so it's pretty fast and scales well (thou

I work on Crux [0], which is also a Java-friendly Datalog database. It sits on top of lazy EAV indexes in RocksDB/LMDB so it's pretty fast and scales well (though technologies like Neo4j/GraphBLAS will be faster!). We don't have online REPL just yet but Nextjournal is pretty great if you want to play through the tutorials interactively [1]. The other unique angle is that Crux gives you "bitemporal" Datalog queries. Oh and the MIT license :) [0] https://opencrux.com https://opencrux.com [1] https://nextjournal.com/crux-tutorial/ https://nextjournal.com/crux-tutorial/