https://distrowatch.com/dwres.php?resource=package-management
A package management reference card for Linux distributions and FreeBSD
I found this from a question asked on Dixtrowatch, about automating the downloading and installing of updates for Packages in a Distro.
Handy summary. I wonder if Slackware still uses tarballs for its "packages" (you wouldn't have called their system a package manager).
Thanks, Bill.