H2 is an embeddable RDBMS written in Java
A fast, low memory, transactional, index, query enabled NoSQL database
SQLite JDBC Driver
One of the fastest embeddable key-value ACID database
Distributed, in-memory key/value store and cache
An in-memory database that persists on disk
An in memory postgres DB instance for your unit tests
Open-source graph database, tuned for dynamic analytics environments
GlueSQL is quite sticky. It attaches to anywhere
A python NoSQL dictionary database, with concurrent access and ACID
A toolkit for SQLite databases
Document-oriented, embedded SQL database
Infinispan is an open source data grid platform
A modern replacement for Redis and Memcached
Real-time analytics on Postgres tables
Lightweight WASM Postgres with real-time, reactive bindings
Simple, efficient, ultra-fast, scalable data store wrapper for LMDB
Embeddable property graph database management system
lightweight connection pooler for PostgreSQL
Tendis is a high-performance distributed storage system
Simple key-value storage with support for multiple backends
Blazing fast and lightweight PostGIS, MBtiles and PMtiles tile server
Pika is a Redis-Compatible database
Micro Graph Database for Python Applications
JavaScript SQL database for browser and Node.js for relational tables