Salix is ​​a Slackware-based GNU/Linux distribution that is simple, fast, and easy to use, with stability being Salix’s primary goal. Salix is ​​also fully backward compatible with Slackware, so Slackware users can benefit from the Salix software repository as their “extra” source of quality software.

Salix 14.0 was released in 2012, so 15.0 is a major version update after 10 years. The update content is as follows:

• This release includes Xfce 4.16 as the main environment, now it is based on GTK+3, almost all other software installed by default has been upgraded to use GTK+3
• Based on Slackware 15.0
• Whiskermenu is now used as the default application launcher
• 15.0’s package base is larger than all previous versions combined
• Software can now be installed using flatpaks
• ConsoleKit has been replaced by elogind
• Linux 5.15.63 kernel
• GCC 11
• Firefox 102ESR
• LibreOffice 7.4
• GIMP 2.10
• GLIBC 2.33
• Salix 15.0 is available in 64-bit and 32-bit versions
• The new version looks:
  • New GTK theme
  • New icon theme
  • New window manager theme
  • New default wallpaper, supports light and dark colors
• translate
  • Supports Catalan, Dutch, English (US and UK), French, German, Greek, Hungarian, Italian, Polish, Portuguese (Brazil and Portugal), Spanish (Spain and Costa Rica), Swedish, Turkish and Ukrainian.

More details can be found here: https://forum.salixos.org/viewtopic.php?f=17&t=8409