Dgraph
Distributed graph database, written in Go. Manish Jain (ex-Google), 2016. GraphQL as the primary query language. Focus on horizontal scale and low latency.
Distinct from Neo4j: native distributed (Raft consensus, sharded storage), GraphQL-first. DQL (Dgraph Query Language) is its own syntax. Open source under Apache 2.0 (after earlier flirting with BSL). Dgraph Labs became Hypermode in 2024, focused on AI applications. Competitors: Neo4j (mainstream, Cypher), TigerGraph (analytics-heavy), JanusGraph (Apache, runs on Cassandra/HBase), ArangoDB (multi-model).