I think there are probably some out there, likely would have started out as a niche contract job (like say fast food POS systems) and have built up from there. Though its really hard to make something like that "great" unless you hire experts from that field to help develop them.
Ask HN: What's the greatest piece of non-dogfooded software?
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Re: Ask HN: What's the greatest piece of non-dogfooded software?
#12The first company that came to mind is Unity. Epic has Unreal and actively dogfoods it by developing Fortnite. But Unity doesn’t really have a flagship product like that, right? I'm sure they use it internally to build sample games, but nothing at AAA scale?