RethinkDB Alternatives

MongoDB (from "humongous") is a scalable, high-performance, open source NoSQL database.

open-source

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

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

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

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

SQLite Home Page

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

An enhanced, drop-in replacement for MySQL

Document-Oriented NoSQL Database

The world's most popular open source database

Amazon DynamoDB is a fast and flexible NoSQL database service for all applications that need consistent, single-digit millisecond latency at any scale. It is a fully managed cloud database and supports both document and key-value store models.

Microsoft Azure is an open, flexible, enterprise-grade cloud computing platform. Move faster, do more, and save money with IaaS + PaaS. Try for FREE.

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