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OrientDB is the most versatile DBMS supporting Graph, Document, Reactive, Full-Text and Geospatial models in one Multi-Model product. OrientDB can run distributed (Multi-Master), supports SQL, ACID Transactions, Full-Text indexing and Reactive Queries.
TypeDB: Built for systems, not records
A transactional, relational-graph-vector database that uses Datalog for query. The hippocampus for AI!
TerminusDB is a Knowledge Graph Database with Version Control. Time-travel, reason, collaborate, branch, merge, diff, and query your data with Datalog.
Object-storage native graph database with branching and typed ontology
Versioned, fast, distributed Datalog engine for everyone.
A simple, fast and versatile Datalog database
VivaceGraph. Open source Common Lisp graph database & Prolog implementation.
Ductile DB is a graph database based on Hadoop/HBase which provides a vast set of features.