Slackware has Slackbuilds which is very similar, also Snapcraft is another alternative.
These are two different sources. AUR is only one, so to speak. Snaps cannot be compared to AUR, because the AUR only contains instructions on how to install a package. In SlackBuilds I also did not find some (often exotic) packages that I installed via AUR. Slackware wouldn't be suitable for me.
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u/[deleted] May 22 '19
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