Datalog is also quite actively used in ontology based data access where Datalog rules are used as mappings between databases and ontologies (see e.g. [1]). Variants and extensions of Datalog is also research actively in the field of answer set programming[2], with many usable implementations.

[1] - http://ontop.inf.unibz.it/ [2] - https://en.m.wikipedia.org/wiki/Answer_set_programming