OpenTSDB - OpenTSDB is a distributed, scalable Time Series Database (TSDB) written on top of HBase.
DBeaver - DBeaver - Universal Database Manager and SQL Client.
Tile38 - Geospatial database and real-time geofence server for managing fleets, mobile apps, and IoT devices.
DataGrip - Tool for SQL and databases
BuntDB - A fast, embeddable, in-memory key/value database for Go with custom indexing and geospatial support
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.