DBeaver - DBeaver - Universal Database Manager and SQL Client.
IBExpert - IBExpert website
MySQL Workbench - MySQL Workbench is a unified visual tool for database architects, developers, and DBAs.
FlameRobin - FlameRobin is a cross-platform, open-source database administration tool for Firebird DBMS.
Navicat - Powerful database management & design tool for Win, Mac & Linux. With intuitive GUI, user manages MySQL, MariaDB, SQL Server, SQLite, Oracle & PostgreSQL DB easily.
RazorSQL - RazorSQL is an SQL Editor and SQL database query tool for macOS, Windows, Linux, and Mac OS X.