Sabayon Linux or Sabayon (formerly RR4 Linux and RR64 Linux), is a Gentoo-based European Linux distribution created by Fabio Erculiani and the Sabayon development team. Sabayon follows the "out of the box" philosophy, aiming to give the user a wide number of applications ready to use and a self-configured operating system.Sabayon Linux features a rolling release cycle, its own software repository and a package management system called Entropy.