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Are you contending that OSes are not applications or challenging the use of the word "app"? Either way, I accept their inclusion of linux. I think you'd use another app on the list: virtualbox. bear in mind that English is not my first language, but as [en.wikipedia.org] states: "Application software is contrasted with system software and middleware, which manage and integrate a computer's capabilities, but typically do not directly apply them in the performance of tasks that benefit the user. The system software serves the application, which in turn serves the user." So yes, I am contending that an OS is not an app(lication). Certainly that is true, but the difference becomes whether or not you are using "application" in the most general sense or in a more specific sense, wherein you might choose to be more specific, making such distinctions. Software and application are interchangeable terms except in the sense that they are more specifically defined, as was done in your excerpt.
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