ArangoDB

ArangoDB sells a multi-model database that combines graph, document, key-value, and search capabilities in one engine, now positioned as a ‘contextual data layer’ for AI agents and enterprise applications.

neo4j

Neo4j is a graph database platform founded in 2007 by Emil Eifrem, Johan Svensson, and Peter Neubauer, initially built to solve the limits of relational databases for highly connected data. […]