Neo4j is a high-performance graph engine with all the features of a mature and robust database. It is a graph database, storing data in the nodes and relationships of a graph. It includes the usual database features like ACID transactions, durable persistence, concurrency control, transaction recovery, high availability. It is massively scalable to handle graphs of several billion nodes on a single machine. It has a powerful traversal framework for high-speed traversals in the node space. It can be deployed as a full server or a very slim database embedded database. 
Neo4j's high-performance distributed cluster architecture scales with your data needs, minimizing cost and hardware while maximizing performance across connected datasets. Neo4j enforces rigorous enterprise security rules while remaining easy to deploy and manage. Protections like “row-level” security in relational databases are not enough when using graphs. Organizations need fine-grained access control for mission-critical security and privacy.

Neo4j is a high-performance graph engine with all the features of a mature and robust database. It is a graph database, storing data in the nodes and relationships of a graph. It includes the usual database features like ACID transactions, durable persistence, concurrency control, transaction recovery, high availability.

Neo4j - Graph Database

HyperGraphDB is a general purpose, open-source data storage mechanism based on a powerful knowledge management formalism known as directed hypergraphs. While a persistent memory model designed mostly for Knowledge management, Artificial Intelligence and Semantic web projects, it can also be used as an embedded object-oriented database for Java projects of all sizes. It could also be used as graph database or as (non-SQL) relational database. 

 A P2P framework for distributed processing has been implemented for replication/data partitioning algorithms as well as client-server style computing. While it falls into the general family of graph databases, it is hard to categorize HyperGraphDB as yet another database because much of its design evolves around providing the means to manage structure-rich information with arbitrary layers of complexity. 

 Source code location: <A HREF="http://code.google.com/p/hypergraphdb" target="_blank">http://code.google.com/p/hypergraphdb</A>

HyperGraphDB is a general purpose, open-source data storage mechanism based on a powerful knowledge management formalism known as directed hypergraphs. While a persistent memory model designed mostly for Knowledge management, Artificial Intelligence and Semantic web projects, it can also be used as an embedded object-oriented database for Java projects of all sizes. It could also be used as graph database or as (non-SQL) relational database.

HyperGraphDB - Database for Storing Strongly-Typed Hypergraphs

HBase provides support to handle BigTable - billions of rows X millions of columns. It is a scalable, distributed, versioned, column-oriented store modeled after Google's Bigtable and runs on top of HDFS (Hadoop Distributed Filesystem). It features compression, in-memory operation per-column. Data could be replicated between the nodes. HBase is used in Facebook and Twitter.

HBase -  Hadoop database

A zero configuration, non-distributed NoSQL key-value store that runs in any Servlet 3.0 compatible container. With Havalo, simply drop havalo.war into your favorite Servlet 3.0 compatible container and with almost no configuration you'll have access to a fast and lightweight K,V store backed by any local mount point for persistent storage.

Havalo - Non Distributed NoSQL Key Value Store

BlobCity DB is an All-in-One Database. It offers support for natively storing 17 different formats of data, including JSON, XML, CSV, PDF, Word, Excel, Log, GIS, Image amongst others. It run two full feature storage engines. One that stores data in memory and the other that stores data on disk. In-memory storage offers sheer performance for real-time analytics, while the disk storage make BlobCity an excellent alternative for DataLakes.


BlobCity - A blazing fast ACID compliant NoSQL DataLake with support for storing 17 formats of data

ConcourseDB is a distributed self-tuning database with automatic indexing, version control and ACID transactions. ConcourseDB provides a more intuitive approach to data management that is easy to deploy, access and scale while maintaining the strong consistency of traditional database systems.

ConcourseDB  - Self-tuning database designed for both transactions and ad hoc analytics across time

AsterixDB is a BDMS (Big Data Management System) with a rich feature set that sets it apart from other Big Data platforms. Its feature set makes it well-suited to modern needs such as web data warehousing and social data storage and analysis. It is a highly scalable data management system that can store, index, and manage semi-structured data, but it also supports a full-power query language with the expressiveness of SQL (and more). 
 
AsterixDB can exploit its knowledge of data partitioning and the availability of indexes to avoid always scanning data set(s) to process queries

AsterixDB is a BDMS (Big Data Management System) with a rich feature set that sets it apart from other Big Data platforms. Its feature set makes it well-suited to modern needs such as web data warehousing and social data storage and analysis. It is a highly scalable data management system that can store, index, and manage semi-structured data, but it also supports a full-power query language with the expressiveness of SQL (and more). 

AsterixDB -  Big Data Management System (BDMS)

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Projects

Neo4j - Graph Database

HyperGraphDB - Database for Storing Strongly-Typed Hypergraphs

HBase - Hadoop database

Havalo - Non Distributed NoSQL Key Value Store

BlobCity - A blazing fast ACID compliant NoSQL DataLake with support for storing 17 formats of data

ConcourseDB - Self-tuning database designed for both transactions and ad hoc analytics across time

AsterixDB - Big Data Management System (BDMS)

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Projects

Neo4j - Graph Database

HyperGraphDB - Database for Storing Strongly-Typed Hypergraphs

HBase - Hadoop database

Havalo - Non Distributed NoSQL Key Value Store

BlobCity - A blazing fast ACID compliant NoSQL DataLake with support for storing 17 formats of data

ConcourseDB - Self-tuning database designed for both transactions and ad hoc analytics across time

AsterixDB - Big Data Management System (BDMS)

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