Cost / License
- Free
- Open Source
Platforms
- Mac
- Windows
- Linux
- BSD

Pivotal GemFire is described as '® is a real-time distributed data store that solves the hard problems of distributed systems for you. It provides a familiar Java interface for interacting with data of arbitrary complexity and shape, and accommodates ever-growing data sets and users with' and is a in-memory database in the development category. There are more than 25 alternatives to Pivotal GemFire for a variety of platforms, including Linux, Mac, Windows, Self-Hosted and Web-based apps. The best Pivotal GemFire alternative is MongoDB, which is free. Other great apps like Pivotal GemFire are Redis, CouchDB, Valkey and DiceDB.

Free & open source, high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.

Titan is a scalable graph database optimized for storing and querying graphs containing hundreds of billions of vertices and edges distributed across a multi-machine cluster. Titan is a transactional database that can support thousands of concurrent users executing complex graph...
Bluzelle is a decentralized and open source database powered by PBFT Consensus Engine. It is a NoSQL key-value store database. Learn about trustless computing and discover the benefits of a decentralized by joining our Beta testing for free.


H2 is a relational database management system written in Java. It can be embedded in Java applications or run in the client-server mode. The disk footprint (size of the jar file) is about 1 MB.
Hazelcast is an in-memory Open Source data grid based on Java. By having multiple nodes form a cluster, data is evenly distributed among the nodes. This allows for horizontal scalability both in terms of available storage space and processing power.
OrbitDB is a serverless, distributed, peer-to-peer database. OrbitDB uses IPFS as its data storage and IPFS Pubsub to automatically sync databases with peers. It's an eventually consistent database that uses CRDTs for conflict-free database merges making OrbitDB an excellent...
LiteDB is an open-source, MongoDB-like database that requires no configuration and is mobile-ready. It's a serverless database delivered in a single DLL under 450kb, fully written in .NET C# managed code and compatible with .NET 4.5 and NETStandard 2.0.



This is a fork of Redis 7.2.4 following the announcement that Redis would switch to a non-free license.
The GridGain In-Memory Data Fabric is a proven software solution, which enables high-performance transactions, real-time streaming and fast analytics in a single, comprehensive data access and processing layer.

VoltDB is a blazingly fast NewSQL database system. It is specifically designed to run on modern scale-out architectures - fast, inexpensive servers connected via high-speed data networks.
high-performance, integrated and distributed in-memory platform for computing and transacting on large-scale data sets in real-time.