DBeaver – Open source SQL Editor

DBeaver is an open source universal database tool for developers and database administrators that has a low memory footprint. It supports JDBC compliant databases such as MySQL, Oracle, IBM DB2, PostgreSQL, SQL Server, Firebird, SQLite, and Sybase. Its main features include the ability to browse and edit databases, create and execute SQL scripts, export data, transaction management and ER diagrams. Additionally, DBeaver’s functionality can be extended by the use of plugins.

dbeaver

Main page : http://dbeaver.jkiss.org/

You can check other alternatives as DataGrip and Navicat.