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The source code of all WSO2 products as well as the scripts that are used for building WSO2 products are maintained in GitHub repositories. If you are a developer, you can easily clone the source code from these Git repositories, and if required, you can do modifications and build a customized product on your own.
To identify the list of repositories that you require, see WSO2 Github Repositories.
Click Repositories used to build WSO2 products, and clone the repositories that are listed for WSO2 Identity Server.