Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
MySQL - The world's most popular open source database
KeyDB - KeyDB is fast NoSQL database with full compatibility for Redis APIs, clients, and modules.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
Dragonfly DB - Dragonfly - Scalable in-memory datastore made simple
SQLite - SQLite Home Page