OrientDB is a deeply scalable Document-Graph DBMS with the flexibility of the Document databases and the power to manage links of the Graph databases. It can work in schema-less mode, schema-full or a mix of both. Supports advanced features such as ACID Transactions, Fast Indexes, Native and SQL
... [More] queries. It imports and exports documents in JSON. Graphs of hundreads of linked documents can be retrieved all in memory in few milliseconds without executing costly JOIN such as the Relational DBMSs do.
OrientDB uses a new indexing algorithm called MVRB-Tree, derived from the Red-Black Tree and from the B+Tree with benefits of both: fast insertion and ultra fast lookup. [Less]
Neo4j is a graph database. It is an embedded, disk-based, fully transactional Java persistence engine that stores data structured in graphs rather than in tables. A graph (mathematical lingo for a network) is a flexible data structure that allows a more agile and rapid style of development.
Virtuoso is a scalable cross-platform server that combines Relational, Graph, and Document Data Management with Web Application Server and Web Services Platform functionality.
A distributed open-source database with a flexible data model for documents, graphs, and key-values. Build high performance applications using a convenient sql-like query language or JavaScript extensions.
Multi-model database
Combine key-value pairs, documents and graphs structures ubiquitously
... [More] and transparently
Sharding & Replication
Benefit from ArangoDB’s rich feature set even when using distributed collections
Extensible through Foxx
Build your own applications and API with JavaScript
Powerful Query Language
AQL is a declarative query language similar to SQL
Strong Consistency
If needed, you can use Transactions and enforce ACID guaranties for your data
Joins, Joins, Joins
Use joins as you would expect in a SQL environment [Less]
Hama is a distributed computing framework based on BSP (Bulk Synchronous Parallel) computing techniques for massive scientific computations, Currently being incubated as one of the incubator project by the Apache Software Foundation
sones GraphDB is a graph database written in C#/.NET sporting the powerful property hypergraph data structure to enable users to store their data in highly complex graph like ways.
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