Netrunner is a complete Linux Operating System for PCs, laptops/netbooks and even ARM microcomputers, that makes exclusive use of the KDE Plasma desktop environment.
The standard version ships with a full set of pre-installed software for everyday usage and is based on Debian Testing or Manjaro/Arch.
The Core version is a slimmed down version based on Debian Stable and allows you to build up your own system or run it on low-spec hardware like arm-boards.