Setapp is described as 'provides a curated collection of commercial apps available through a low-cost subscription. Access to the apps is driven by a straight-forward local app that neatly organizes them in a searchable, filterable and configurable list' and is an app in the Online Services category. There are six alternatives to Setapp for Mac, Online / Web-based and Linux. The best alternative is Homebrew, which is both free and Open Source. Other great apps like Setapp are Cakebrew (Free, Open Source), Mac App Store (Free), MacPorts (Free, Open Source) and macapps.link (Free).
The Mac App Store is the best place to find apps for Mac. No more boxes, no more disks, no more time-consuming installation. Just like the App Store for iPhone and iPad, click once to download and install any app on your Mac.
The MacPorts Project is an open-source community initiative to design an easy-to-use system for compiling, installing, and upgrading either command-line, X11 or Aqua based open-source software on the Mac OS X operating system.