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