Neo4j

 

https://www.quackit.com/neo4j/tutorial/about_neo4j.cfm

https://www.quackit.com/neo4j/tutorial/neo4j_create_a_relationship_using_cypher.cfm

https://community.neo4j.com/t5/neo4j-graph-platform/get-all-nodes-and-the-relations-of-all-nodes/td-p/54631

https://neo4j.com/graphacademy/training-gdm-40/01-introduction-graph-data-modeling/

https://neo4j.com/videos/graph-data-modeling-tips-tricks/