JanusGraph

JanusGraph is a scalable graph database optimized for storing and querying graphs containing hundreds of billions of vertices and edges distributed across a multi-machine cluster. As an open-source project under The Linux Foundation, it features contributions from leading tech companies. Features include scalability to handle graphs with hundreds of billions of vertices and edges, fully open source under Apache 2 license, transactional support with ACID and eventual consistency for thousands of concurrent users, data storage compatibility with Apache Cassandra, Apache HBase, Google Cloud Bigtable, Oracle BerkeleyDB and ScyllaDB, advanced search with Elasticsearch, Apache Solr and Apache Lucene, analytics support for both OLTP and OLAP with Apache Spark integration, TinkerPop integration with native support for Gremlin, third-party adapters for Aerospike, DynamoDB and FoundationDB, and visualization compatibility with various tools.