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In general, open-source all abandonware. Here's a few examples of non-game old software that would benefit the society if open-sourced: Windows 9x and classic Mac OS. No one has sold these OSes for 20+ years and they turned out to be evolutionary dead ends. It would make sense to release their sources so people could learn from them and run them on new hardware more easily. Flash Player. Adobe has stated in no uncert…
man I wish they had open sourced OS/2. It could have a linux sized community at this point. Sadly microsoft had put so much of their code in it, that they didn't allow the release (according to my dad who worked for IBM and was even called "Mr. OS/2" because he had sold it so good to companies)
https://hackaday.com/2023/02/16/arcaos-os-2-updated-for-the-...