OrientDB has the flexibility of the Document databases and the power of the Graph databases to manage relationships. It can work in schema-less mode, schema-full or a mix of both. It can store up to 150,000 records per second on common hardware. OrientDB has been designed to be very fast. It inherits the best features and concepts from the Object Databases, Graph DBMS and the modern NoSQL engines. 
 Source code location: <A HREF="http://code.google.com/p/orient/" target="_blank">http://code.google.com/p/orient/</A>

OrientDB has the flexibility of the Document databases and the power of the Graph databases to manage relationships. It can work in schema-less mode, schema-full or a mix of both. It can store up to 150,000 records per second on common hardware. OrientDB has been designed to be very fast. It inherits the best features and concepts from the Object Databases, Graph DBMS and the modern NoSQL engines.

OrientDB - The NoSQL Graph-Document DBMS

ArangoDB is a multi-purpose open-source database with flexible data model for documents, graphs, and key-values. Build high performance application using a convenient sql-like query language or JavaScript/Ruby extensions. Its key features are  Schema-free, Convenient querying using AQL, Extendable through JS, Space efficiency, Supports modern storage hardware, like SSD and large caches and lot more.

ArangoDB - The Multi-purpose NoSQL DB

Redcon is a custom Redis server framework for Go that is fast and simple to use. The reason for this library it to give an efficient server front-end for the BuntDB and Tile38 projects. Redcon has full TLS support.

Redcon - Redis compatible server framework for Go

Aerospike is a distributed, scalable NoSQL database. It provides support to create a high-performance, scalable platform that would meet the needs of today's web-scale applications. It supports operational efficiency, robustness and reliability expected from traditional databases.
 
It eliminates complex, costly caching layers commonly used in NoSQL and in-memory solutions. It 
delivers elastic, predictable performance at internet scale via patented Hybrid Memory Architecture.

Aerospike is a distributed, scalable NoSQL database. It provides support to create a high-performance, scalable platform that would meet the needs of today's web-scale applications. It supports operational efficiency, robustness and reliability expected from traditional databases.

Aerospike Database Server – Flash-optimized, in-memory, nosql database

SSDB is a high performace key-value(key-string, key-zset, key-hashmap) NoSQL database, an alternative to Redis. SSDB is stable, production-ready and is widely used by many Internet companies including QIHU 360. Its feature include Redis client support, Persistent queue service, LevelDB  support, Built in CLI and lot more.

SSDB - A fast NoSQL database, an alternative to Redis

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

upscaledb is a fast key-value database which optimizes storage and algorithms for your specific data types. upscaledb can be used to build all functions of a typical SQL database, tailored to the specific needs of your application, and directly linked into your program.
 
Its blazingly fast analytical functions and database cursors make it a natural fit to process data whenever a SQL database is not fast enough. A simple and self-documenting API; extensive documentation and a tutorial are provided. APIs for C/C++, Java, Python, .NET (i.e. C#, VB.NET), Erlang/Elixir and PHP are available.

upscaledb is a fast key-value database which optimizes storage and algorithms for your specific data types. upscaledb can be used to build all functions of a typical SQL database, tailored to the specific needs of your application, and directly linked into your program.

upscaledb - A very fast lightweight embedded database engine with a built-in query language.

NoSql, JSON based, Document store database with compiled .net map functions and automatic hybrid bitmap indexing and LINQ query filters

RaptorDB - The Document Store

CurioDB is a distributed and persistent Redis clone, built with Scala and Akka. Please note that despite the fancy logo, this is a toy project, hence the name "Curio", and any suitability as a drop-in replacement for Redis is purely incidental.

CurioDB - Distributed & Persistent Redis Clone built with Scala & Akka

Skytable is an effort to provide the best of key/value stores, document stores and columnar databases, that is, simplicity, flexibility and queryability at scale. The name 'Skytable' exemplifies our vision to create a database that has limitless possibilities. It is natively multithreaded and scales to millions of queries per second per node with no optimizations left off the table. The database server doesn't need more than 1MB to run. 

Skytable - Your next NoSQL database

Bangdb is pure vanilla key value nosql data store. The goal of bangdb is to be fast, reliable, robust, scalable and easy to use data store for various data management services required by applications. Bangdb comes in flavors like Embedded In memory, Network, Distributed data grid/ Elastic Cache. The bangdb is highly concurrent and runs parallel operations as much as possible.

BangDB - NoSQL for Real Time Performance

CodernityDB is pure python (no 3rd party dependency), fast multi-platform, schema-less, NoSQL database. It has optional support for HTTP server version (CodernityDB-HTTP), and also Python client library (CodernityDB-PyClient) that aims to be 100% compatible with embeded version. It is an advanced key-value database, with multiple key-values indexes in the same engine. It has support for Multiple indexes, Custom storage, Sharding.

CodernityDB - Pure python, NoSQL, Fast Database

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