Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
RDF: Resource Description Framework OWL: Web Ontology Language
Products
neo4j
RDFox
Unique features of RDFox include the very powerful rule language (roughly equal to SPARQL query language) and incremental maintenance of materialised edges. It is also very high performance; typically orders of magnitude faster than other KGs.
Amazon Neptune
Neptune can support very large KGs, but it doesn’t support rules/reasoning, and is very slow compared to RDFox. We have a collaboration with Neptune where we use RDFox to support reasoning and fast query answering over large KGs stored in Neptune.
TopBraid
AFAIK Top Braid has a relatively limited language (SHACL), mainly for defining constraints. RDFox can load SHACL, but it supports much more powerful rules for generating new edges.
Allegro
Allegro graph is a triple store, but AFAIK it has very limited support for ontologies/rules.