Supabase - An open source Firebase alternative
MySQL - The world's most popular open source database
Apache Cassandra - The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
Patroni - A Template for PostgreSQL HA with ZooKeeper, Etcd, or Consul
SQLite - SQLite Home Page