An in-memory database that persists on disk
An Embedded NoSQL, Transactional Database Engine
Hypothetical Indexes for PostgreSQL
Embeddable, replicated and fault tolerant SQL engine
High performance NoSQL database based on bitcask
Apache IoTDB
Command-line admin tool for observing and troubleshooting Postgres
H2 is an embeddable RDBMS written in Java
Scalable, fast, and disk-friendly vector search in Postgres
Irmin is a distributed database
DLE provides blazing-fast database cloning to build dev environments
Distributed database ecosphere
GridDB is a next-generation open source database
A relentless key-value store for the browser
Relational Database
Lightweight on-disk hash table for fast key-value storage in pure PHP
High-performance, NoSQL engine with transactions for Perl
A tiny KV storage based on skiplist written in C++ language
High performance datastore for time series and tick data
DataFrame server for financial timeseries data
A basic REST service for JSON data - enough for prototyping and MVPs
Columnar storage extension for Postgres
An Internet-scale database
An in-memory database based on the CouchDB REST API
In-memory NoSQL database with ACID transactions, Raft consensus, etc.