JanusGraph

JanusGraph is a highly scalable, open-source graph database optimized for storing and querying large-scale graphs across a distributed cluster.

It is architected on the Apache TinkerPop framework, meaning its primary query interface is the Gremlin traversal language.

JanusGraph is not a standalone database but rather a graph layer that uses external storage backends, giving users flexibility to choose from various options like Apache Cassandra, Apache HBase, or Google Bigtable for its data persistence.

This decoupled architecture allows it to handle petabytes of data and trillions of edges and vertices.

It also integrates with analytics platforms like Apache Spark and Apache Flink for complex data processing.