SlackEX is based on Slackware 14.1.
Slackware is the first widely-used Linux system, which is still developing. Slackware has existed since 1993.
New features in version 151211 of SlackEX
I have replaced kernel 4.1.1-x86_64-exton with kernel
4.3.1-x86_64-exton with support for “everything”. KDE is downgraded to version 4.10.5 from version 4.11.1. All other component software is also upgraded to the latest Slackware version by now. I may mention in particular GParted 0.24.0...