DBeaver - DBeaver - Universal Database Manager and SQL Client.
InfluxData - Scalable datastore for metrics, events, and real-time analytics.
DataGrip - Tool for SQL and databases
TimescaleDB - TimescaleDB is a time-series SQL database providing fast analytics, scalability, with automated data management on a proven storage engine.
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.
Prometheus - An open-source systems monitoring and alerting toolkit.