Is Slackware Dead 2020?
No, Slackware is alive and well.
Which package is used in Slackware system?
Included in the base installation of Slackware are two packages pkgtools and slackpkg. pkgtools contains a set of applications that are to be used for basic package management. slackpkg is a package manager and update tool for you to use with the official Slackware servers.