Infinispan is an open source data grid platform and highly scalable NoSQL cloud data store.

✔️ Secure, simple key-value storage for Android

A fast, log structured key-value store.

TuplDB is a high-performance, concurrent, transactional, scalable, low-level embedded database.

Red Hat Datagrid simple tutorials

A distributed in-memory key-value storage for billions of small objects.

BBoxDB is a scalable, highly available, and distributed data store for multi-dimensional big data. The software supports operations like multi-dimensional range queries and spatial joins. In addition, data streams are supported.

Kronotop is a distributed document database that combines ACID transactions with simplicity at any scale.

Single-threaded off-heap object store

Memory allocator and management for billions of very small objects

Teragrep Lookup Table Library for Java

A set of core libraries for Java

[D2 CAMPUS FEST mini 최우수상 수상작] Distributed In-memory Key-value Store

☕ Simple, lightweight, distributed in-memory key-value store written in java using CM and netty

An insanely fast and lightweight key value database with json and binary support. Provides insanely fast binary protocol server alongside with simple and robust REST service. One database to to rule them all.

[D2 CAMPUS FEST mini 최우수상 수상작] Distributed In-memory Key-value Store

Using column families in RocksDB

LynxDB is a distributed storage writen by Java language, Supporting (key, column family, column, value) structured storage.

Key/value storage based on LSM-tree

SimpleDB: a minimalist Key Value store written in Java