A Survey on Graph Databases for Java Developers | Javalobby

• A Survey on Graph Databases for Java Developers | Javalobby
• Yet Another Guide to NoSQL Databases « Elements of Study on Information Technologies
• 5 Graph Databases to Consider - ReadWriteCloud
• Survey of Distributed Databases | NoSQL wiki on DBPedias | All your database are belong to you

• In Graph Theory, a simple graph is a set of nodes and edges. 
• At least, graph databases are expected to support fast traversal — this is the reason why we do not simply use tabular databases like HBase or Cassandra to store all the edges (join operation is expensive). 
• Graph databases are one of four major categories of NoSQL databases

• 1. Neo4J (Neo Technology)
• Popular
• Particularly developed for Java applications, but it also supports Python.
• GPLv3
• With Advanced and Enterprise editions available under both the AGPLv3 as well as a commercial license.

• 2. Infinite Graph (Objectivity Inc.)
• 3. DEX (Sparsity Technologies)
• 4. InfoGrid (Netmesh Inc.)
• 5. HyperGraphDB (Kobrix Inc.)
• 6. Trinity (Microsoft)
• 7. AllegroGraph (Franz Inc.