PSequel is described as 'PostgreSQL GUI tool for Mac OS X' and is an app in the Development category. There are more than 25 alternatives to PSequel for a variety of platforms, including Mac, Windows, Linux, Online / Web-based and Self-Hosted solutions. The best alternative is DBeaver, which is both free and Open Source. Other great apps like PSequel are HeidiSQL (Free, Open Source), phpMyAdmin (Free, Open Source), DataGrip (Paid) and pgAdmin (Free, Open Source).
DBeaver - Universal Database Manager and SQL Client. DBeaver is free and open source (GPL) universal database tool for developers and database administrators. Usability is the main goal of this project, program UI is carefully designed and implemented.
HeidiSQL is a useful tool designed for web developers using the popular MySQL server, Microsoft SQL databases and PostgreSQL. It enables you to browse and edit data, create and edit tables, views, procedures, triggers and scheduled events.
phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL over the Web. Currently it can create and drop databases, create/drop/alter tables, delete/edit/add fields, execute any SQL statement, manage keys on fields.
Adminer (formerly phpMinAdmin) is a full-featured database management tool written in PHP. Conversely to phpMyAdmin, it consist of a single file ready to deploy to the target server. Adminer is available for MySQL, PostgreSQL, SQLite, MS SQL and Oracle
TablePlus is a native app which helps you easily edit database data and structure. TablePlus includes many security features to protect your database, including native libssh and TLS to encrypt your connection.