Slackware is the oldest surviving Linux distribution, maintained since 1993 by Patrick Volkerding with a philosophy that has not moved an inch: keep it simple, keep it UNIX-like, and change nothing without reason. There is no dependency resolution in its package tools by design; you are trusted to know your system. Configuration is plain text files, services are BSD-style scripts, and nothing happens behind your back.
That sounds austere, and it is, but it is also why Slackware installs from 2015 still run today. The full install ships a complete environment (KDE Plasma included) that simply works, and the system's transparency makes it a superb teacher. Slackware is a statement that an operating system can be finished, comprehensible, and calm. Its users would not trade it for anything.
Strengths
Unmatched longevity and stability; the definition of battle-tested.
Total transparency: plain configs, no hidden magic, no surprises.
The full install is complete and coherent out of the box.
Teaches real UNIX fundamentals better than almost anything.
Ships a current KDE Plasma despite the traditionalist core.
Watch-outs
No official dependency resolution; you manage libraries or use full installs.
Releases are years apart; current packages arrive via -current, the testing branch.
Assumes real willingness to read documentation and edit files.
Standout features
The oldest active distro: running since 1993 under one maintainer's vision.
BSD-style init that admins of a certain generation consider perfection.
SlackBuilds.org: the community's clean, auditable package recipes.
A full install philosophy: everything works because everything is there.
Who it's for
Best for
UNIX traditionalists, learners who want to see how it all really works, and systems meant to run unchanged for a decade.
Maybe not for
Anyone who expects automatic dependency handling, frequent releases, or hand-holding of any kind.
The Slackware player profile
In Distro Fighter, Slackware tends to win for people who…
SLACKWARE
want total controlwould rather avoid systemddo dev / server workrun older / low-spec hardwarewant a traditional, editable systemwant rock-solid stabilitylive in the terminalwant a lean, no-nonsense distro