Non-relational Database Management systems

InfoGrid

Internet graph database. Represents information as nodes and edges, which may carry properties and may be typed. Selection of storage backends including MySQL, Postgresql, native files and NoSQL.

Optional components map URLs directly to objects in the graph database with custom rendering via the Viewlet framework.

Very easy to access external data sources as always-up-to-date object graphs within InfoGrid.

Riak

Riak combines a decentralized key-value store, a flexible map/reduce engine, and a friendly HTTP/JSON query interface to provide a database ideally suited for Web applications.

Redis

Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache and message broker. It supports data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs and geospatial indexes with radius queries. Redis has built-in replication, Lua scripting, LRU eviction, transactions and different levels of on-disk persistence, and provides high availability via Redis Sentinel and automatic partitioning with Redis Cluster.

Hypertable

Hypertable was an open-source software project to implement a database management system inspired by publications on the design of Google's BigTable.
Hypertable runs on top of a distributed file system such as the Apache HDFS, GlusterFS or the CloudStore Kosmos File System (KFS). It is written almost entirely in C++ as the developers believed it had significant performance advantages over Java.

VoltDB

VoltDB - Fast, scalable, open-source OLTP SQL database with ACID is an alternative to NoSQL key-value stores and database sharding.

Apache CouchDB

CouchDb is a distributed document database system with bi-directional replication. It makes it simple to build collaborative applications that can be replicated offline by users, with full interactivity (query, add, update, delete), and later "synced up" with everyone else's changes when back online.

Cascading

Cascading is a feature rich API for defining and executing complex and fault tolerant data processing workflows on a Hadoop cluster.

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Cassandra

Cassandra is a highly scalable, eventually consistent, distributed, structured key-value store.

MongoDB

MongoDB is a high-performance, open source, schema-free document-oriented data store that's easy to deploy, manage and use.

Cloudera Impala

Cloudera Impala provides fast, interactive SQL queries directly on your Apache Hadoop data stored in HDFS or Hbase.

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