DuckDB is an analytical in-process SQL database management system

Simple and fast JSON database

libSQL is a fork of SQLite that is both Open Source, and Open Contributions.

An educational OLAP database system.

Lightning Memory Database (LMDB) for Java: a low latency, transactional, sorted, embedded, key-value store

Transactional schema-less embedded database used by JetBrains YouTrack and JetBrains Hub.

A transactional, relational-graph-vector database that uses Datalog for query. The hippocampus for AI!

A fast, log structured key-value store.

Modern embedded SQL database

NoSQL embedded document store for Java

chDB is an in-process OLAP SQL Engine 🚀 powered by ClickHouse

A cloud native embedded storage engine built on object storage.

A simple, fast and versatile Datalog database

Limbo is a work-in-progress, in-process OLTP database management system, compatible with SQLite.

A lightweight document-oriented NoSQL database written in pure Golang.

Scalable graph analytics database powered by a multithreaded, vectorized temporal engine, written in Rust

PoloDB is an embedded document database.

A portable embedded database using Arrow.

A library for creating isolated embedded databases for Spring-powered integration tests.

Python bindings for the UnQLite embedded NoSQL database