PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
MySQL - The world's most popular open source database
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Google Cloud Spanner - Google Cloud Spanner is a horizontally scalable, globally consistent, relational database service.
SQLite - SQLite Home Page
TimescaleDB - TimescaleDB is a time-series SQL database providing fast analytics, scalability, with automated data management on a proven storage engine.