On my main site, (AU) answers including commercial software are on-topic as long as it's relevant and you're not the owner or you disclose you're the owner and you don't use the platform to SPAM.

As I just posted an answer referring someone to commercial software (although with a money-back guarantee) just asking if that's allowed here too as some rules seem to be interpreted slightly differently by different mods on different sites.

Note: I personally own a copy of said software but am not Commercially affiliated with GRC in any way: I'm just a happy user.

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    It seems to me the relevant demarcation is free vs proprietary software. Not commercial vs noncommercial. Since even Free Software is potentially commercial. I could put up an ad to sell copies of the GNU Emacs program for USD 1000 per license, and it would be perfectly legal, though only a lunatic would buy it. In fact, something similar used to be an important source of funding for the GNU Project/FSF, though that was before the rise of the Internet. Commented Nov 8, 2018 at 17:36
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    @FaheemMitha I'm not convinced that the relevant criteria for you are also relevant to others. The vast majority of Linux users happily use gratis proprietary software, most probably do without even knowing. Commented Nov 16, 2018 at 14:04
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    @DmitryGrigoryev When it comes to software, it's the really significant distinction, whether users recognize it or not. Commented Nov 16, 2018 at 19:45

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I don't think there is any rule against mentioning commercial software in an answer; indeed not all Unix variants are open source. I think we'd even be fine with pointing to software you're selling, provided the relationship is disclosed and most importantly its actually, truly an on-topic answer to the question. What we of course do not tolerate is spam, but if someone asks a question where the answer really is to go buy a given program, that's not spam. And (for if this answer is referenced in future situations) of course this is presuming everything done in good faith; e.g., it wouldn't apply to someone asking—or having a shill ask—a question just so he could promote his program; that'd be spam.

In this case, I'm somewhat confused though — isn't that a Windows program, so not really helpful to someone running a Unix/Unix-like OS? Also, does it have any hope of recovering from a disk that doesn't even report its capacity correctly?


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