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.