DBConvert for Oracle & PostgreSQL - Migrate Oracle database to PostgreSQL server or backwards.
DBeaver - DBeaver - Universal Database Manager and SQL Client.
KS DB Merge Tools - Database diff and merge tools
MySQL Workbench - MySQL Workbench is a unified visual tool for database architects, developers, and DBAs.
Devart Studio for SQL Server - dbForge Studio for SQL Server is a powerful SQL Server GUI Tool for SQL Server database management, administration, development, datareporting and analysis.
Navicat - Powerful database management & design tool for Win, Mac & Linux. With intuitive GUI, user manages MySQL, MariaDB, SQL Server, SQLite, Oracle & PostgreSQL DB easily.