SabayonLinux (formerly known as RR4 Linux/RR64 Linux) is a Gentoo based Linux distribution created by Fabio Erculiani.
Sabayon differs from Gentoo in that instead of installing the entire operating system from source code, the initial install is made using pre-compiled binary packages. Sabayon, however, does include the source code. The distribution is currently available for x86 and x86-64 platforms. Sabayon uses the Portage system from Gentoo for package management, meaning that all updates are inline with Gentoo's portage tree.