SQLDeveloper 21.4.2 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free Mac application is a product of Oracle. We recommend checking the downloaded files with any free antivirus. The program is categorized as Developer Tools. The most popular versions of the tool are 3.1 and 1.1.
From the developer:
Oracle SQL Developer is a free graphical tool that enhances productivity and simplifies database development tasks. With SQL Developer, you can browse database objects, run SQL statements and SQL scripts, edit and debug PL/SQL statements, manipulate and export data, and view and create reports.
You may want to check out more Mac applications, such as App Factory, which might be similar to SQLDeveloper.