PostGIS - Open source spatial database
DBeaver - DBeaver - Universal Database Manager and SQL Client.
H2GIS - A spatial extension of the H2 database. Compliant, Solid, Tested.
MySQL Workbench - MySQL Workbench is a unified visual tool for database architects, developers, and DBAs.
QGIS - QGIS is a desktop geographic information system, or GIS.
Sequel Pro - MySQL database management for Mac OS X