InfluxData - Scalable datastore for metrics, events, and real-time analytics.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
TimescaleDB - TimescaleDB is a time-series SQL database providing fast analytics, scalability, with automated data management on a proven storage engine.
MariaDB - An enhanced, drop-in replacement for MySQL
VictoriaMetrics - Cost-effective database for huge amounts of time series data
MySQL - The world's most popular open source database