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http://www.mckoi.com/index.html

Distributed Database (MckoiDDB) Website

Mckoi Distributed Database (MckoiDDB) MckoiDDB is a database system used by software developers to create applications that store data over a cluster of machines in a network. It is designed to be used in online environments where there are very large sets of both small and big data items that need to be stored, accessed and indexed efficiently in a network cluster. The focus of the MckoiDDB architecture is to support low latency query performance, provide strong data consistency through snapshot transaction isolation, and provide tools to manage logical data models that may change dramatically in physical network environments that may experience similar dramatic change.
http://cassandra.apache.org/

The Apache Cassandra Project

The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance. Linear scalability and proven fault-tolerance on commodity hardware or cloud infrastructure make it the perfect platform for mission-critical data. Cassandra's support for replicating across multiple datacenters is best-in-class, providing lower latency for your users and the peace of mind of knowing that you can survive regional outages. Cassandra's ColumnFamily data model offers the convenience of column indexes with the performance of log-structured updates, strong support for materialized views , and powerful built-in caching. Cassandra is in use at Netflix , Twitter , Urban Airship , Constant Contact , Reddit , Cisco, OpenX, Digg, CloudKick, Ooyala, and more companies that have large, active data sets.
Spring Data Neo4j E-book Available Now! http://neo4j.org/

neo4j open source nosql graph database »

I've been trying to follow the fast-moving world of NoSQL lately, and -- like a visit to the carnival funhouse -- it has left me with double vision, queasy stomach, and a staggering gait. (And it's not even Saturday morning...) Yet I find myself coming back for more. http://asserttrue.blogspot.com/2009/12/nosql-required-reading.html

NoSQL Required Reading