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Much modern software runs on at least two of the common platforms (Windows, Mac, Linux, Android, iOS). So what is the value of the category?
Any software written in many languages which is careful not to use platform-dependent features is automatically cross-platform.
Most software that runs on more than one platform is not listed here. Consider, say, historically important programs like Visicalc and DOCTOR.
Some software only ran on multiple platforms in certain versions. Consider Mathcad, which gave up on its Mac port.
How different do two platforms need to be for software to be considered "cross-platform"? Many programs ran on both TOPS-10 and ITS, which were very different and incompatible operating systems, both for the PDP-10. Much software for them could be built for either one.
How similar do the two versions have to be? TECO (text editor) existed on many machines, but each machine's version was somewhat different.
Some of these problems can be resolved by defining the category more carefully -- to exclude programming languages, say -- but mostly, the category seems to be far too big to be meaningful or useful to anyone. --Macrakis (talk) 17:56, 18 March 2021 (UTC)[reply]