RazorSQL

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Sequel Ace

HeidiSQL is a free and open-source GUI for MariaDB, MySQL, Microsoft SQL, PostgreSQL and SQLite databases. With HeidiSQL, you can spectate and edit data and structure of your database in an intuitive interface. The software allows you to connect to your database via SSH tunnel or with SSL, and connect to multiple servers simultaneously, while also being able to monitor and kill client process in real-time.

DBeaver is an open-source SQL client and a database administration tool. With DBeaver you can manage any relational databases that has support for JDBC driver, in a well designed GUI. The software is released as two separate versions, DBeaver Community Edition and DBeaver Enterprise Edition. DBeaver Community Edition is freely used and distributed under the ACL license. While DBeaver Enterprise Edition is sold at a monthly subscriptions, and supports NoSQL databases like MongoDB, Cassandra, InfluxDB, Redis, Amazon DynamoDB, Google Bigtable and CouchDB.

PopSQL is an collaborativ SQL editor for macOS, Linux and Windows. PopSQL is used by data analysts, product managers, customer success, operations, and anyone that wants to write SQL. As it allows them to write queries, visualize data, and share your results with their co-workers and team.

dbForge Studio for MySQL is a universal GUI tool for MySQL and MariaDB database development, management, and administration. 

pgModeler is an open source software for modeling PostgreSQL databases. It merges the classical concepts of modeling using entity-relationship diagrams with specific features that only PostgreSQL implements. With pgModeler you can create and edit database models easily with a simple and intuitive interface. pgModeler allows you to design your database once with dynamic code generation, and export to multiple versions of PostgreSQL ranging from 9.x to 13.x.

The software pgAdmin is the most popular free and open-source administration panel for PostgreSQL. With pgAdmin developers can manage their database and also use it as a tool that is part of the development process. The software is released under the PostgreSQL/Artistic licence and can be used on macOS, Linux, Unix and Windows to manage PostgreSQL 9.2 and above.