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
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
Infinispan is an open source data grid platform
Open-source graph database, tuned for dynamic analytics environments
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 modern replacement for Redis and Memcached
Real-time analytics on Postgres tables
Simple key-value storage with support for multiple backends
Document-oriented, embedded SQL database
Lightweight WASM Postgres with real-time, reactive bindings
Embeddable property graph database management system
Micro Graph Database for Python Applications
lightweight connection pooler for PostgreSQL
Simple, efficient, ultra-fast, scalable data store wrapper for LMDB
Pika is a Redis-Compatible database
GridDB is a next-generation open source database
High-performance C# DynamoDb library
Skytable is a fast, secure and reliable realtime NoSQL database