Pere Urbón ☞ published a short review of a couple of existing graph databases. For your reference, below are the ones reviewed in the post and a couple more that we’ve previously mentioned here on myNoSQL:
☞ Neo4j is an embedded, disk-based, fully transactional Java persistence engine that stores data structured in graphs rather than in tables.
☞ DEX is a high performance library to manage very large graphs or networks
☞ HyperGraphDB: a general purpose, extensible, portable, distributed, embeddable, open-source data storage mechanism.
☞ InfoGrid: an Internet Graph Database with a many additional software components that make the development of REST-ful web applications on a graph foundation easy.
☞ vertexdb: a high performance graph database server that supports automatic garbage collection.
Note: by checking the project homepage I cannot tell if the project is still active or not.
☞ AllegroGraph RDFStore: a modern, high-performance, persistent RDF graph database.
Note: AllegroGraph seems to be positioned in the RDF stores space, which features some other solutions too.
☞ Filament: a graph persistence framework and associated toolkits based on a navigational query style.
☞ Sones GraphDS provides an inherent support for high-level data abstraction concepts (graph structures, walks, consistency, editions, revisions, copies), its own Graph Query Language, an underlying distributed file system and various interfaces like SOAP, REST or WebDAV.
And I’m not sure these are all …
Update: make sure you check the NoSQL Graph Database Matrix