Oracle SQL Developer is available for download free of charge from the Oracle Technology Network.
To install SQL Developer, simply download and unzip it on your system. SQL Developer does not include an installation program.
To download SQL Developer:
Go to the Downloads tab of the Oracle SQL Developer home page:
Select the documentation links to view the release notes, a list of new features, and the SQL Developer Documentation Library.
The documents in the Documentation Library are available for online viewing or for download in PDF, Mobi (for Kindle), or ePub (for iBook) format. You can bookmark the Documentation Library page for ease of access:
Select the installation instructions for your platform and follow the instructions to download and start SQL Developer.
SQL Developer requires the Java Development Kit (JDK) version 1.7 or later. If the JDK is not included in the SQL Developer software download bundle and you do not have it installed on your system, then you must download and install it separately.
The SQL Developer installation instructions include a link to the JDK download page.
The first time you start SQL Developer, you must supply the path to the JDK.