NosDB

NosDB is a 100% native .NET Open Source NoSQL Database (released under the Apache 2.0 License).

20 Alternatives To NosDB

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Apache Cassandra

The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance.

Apache HBase

Apache HBase – Apache HBase™ Home
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ArangoDB

A distributed open-source database with a flexible data model for documents, graphs, and key-values.

Azure Cosmos DB

NoSQL JSON database for rapid, iterative app development.

CouchBase

Document-Oriented NoSQL Database

CouchDB

HTTP + JSON document database with Map Reduce views and peer-based replication

Firebird

Relational database offering many ANSI SQL standard features that runs on Linux, Windows, and a variety of Unix platform

KeyDB

KeyDB is fast NoSQL database with full compatibility for Redis APIs, clients, and modules.
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MariaDB

An enhanced, drop-in replacement for MySQL

MySQL Community Edition

MySQL :: MySQL Community Edition
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MySQL Workbench

MySQL Workbench is a unified visual tool for database architects, developers, and DBAs.

OrientDB

OrientDB - The World’s First Distributed Multi-Model NoSQL Database with a Graph Database Engine.
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PostgreSQL

PostgreSQL is a powerful, open source object-relational database system.

Raven DB

Introducing RavenDB 4. 0. A Fully Transactional Open Source NoSQL Document Database. Easy to use, rapidly scalable, offers high availability, and takes your Business into the Next Generation of Data Performance.
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Redis

Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.

RethinkDB

The open-source database for the realtime web

Titan Database

Titan : Distributed Graph Database
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VoltDB

In-memory relational DBMS capable of supporting millions of database operations per second

neo4j

Meet Neo4j: The graph database platform powering today’s mission-critical enterprise applications, including artificial intelligence, fraud detection and recommendations.