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Open Source NoSQL databases

LEADING OPEN SOURCE NOSQL DATABASES

OTHER OPEN SOURCE NOSQL DATABASES

Apache Jackrabbit is a fully conforming implementation of the Content Repository for Java Technology API (JCR). A content repository is a hierarchical content store with support for structured and unstructured content, full text search, versioning, transactions, observation, and more. Typical applications that use content repositories include content management, document management, and records management systems.

InfoGrid is an Internet Graph Database with a many additional software components that make the development of REST-ful web applications on a graph foundation easy.

Open source dynamo clone written in Erlang.

MemcacheDB is a distributed key-value storage system designed for persistent. It is NOT a cache solution, but a persistent storage engine for fast and reliable key-value based object storage and retrieval. It conforms to memcache protocol(not completed, see below), so any memcached client can have connectivity with it. MemcacheDB uses Berkeley DB as a storing backend, so lots of features including transaction and replication are supported.

RavenDB is a transactional, open-source Document Database written in .NET, offering a flexible data model designed to address requirements coming from real-world systems. RavenDB allows you to build high-performance, low-latency applications quickly and efficiently.

Data in RavenDB is stored schema-less as JSON documents, and can be queried efficiently using Linq queries from .NET code or using RESTful API using other tools. Internally, RavenDB make use of indexes which are automatically created based on your usage, or were created explicitly by the consumer.

LevelDB is a fast key-value storage library written at Google that provides an ordered mapping from string keys to string values.

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