Apache Ignite Alternatives

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

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

open-source

High-performance, distributed memory object caching system

Clustering and highly scalable data distribution platform for Java

Document-Oriented NoSQL Database

A NoSQL database running in a Lua application server.

Open Source .NET Distributed Cache!

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

The open-source database for the realtime web

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

TheGridGain In-Memory Computing Platform is a comprehensive solution provides speed and scale for data intensive applications across any data store

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