Arduino continues to be open source

They are available for download from the link under this section of the "Software" page:

https://www.arduino.cc/en/software/#app-lab-section

Thanks for your interest in contributing to the project development!

Unfortunately the repository of the Arduino App Lab codebase has not yet been published. For this reason, it is not really feasible for the community to contribute to that codebase.

However, much of the non-GUI functionality of the Arduino App Lab application is provided by Arduino App CLI, which does have a public repository:

Pull requests are very welcome in that repository. There are various other components and helper tools which also have public repositories. I listed most of those here:

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