neo4j

When data is full of complex relationships, querying multi-hop relations in a relational DB gets harder. Neo4j stores it as a graph: the leading graph database, naturally suited to relationships, storing data as nodes and relations and traversing them with the intuitive Cypher query language, great for social, recommendation and knowledge graphs.

Features

Graph database: A leading native graph database.

Relationship queries: Great at complex multi-hop relations.

Cypher: An intuitive graph query language.

Ecosystem: A mature graph-data ecosystem.