Arch Linux!

Linux Mint is an elegant, easy to use, up to date and comfortable GNU/Linux desktop distribution. Linux Mint is an Ubuntu -based distribution ( so Debian based ) whose goal is to provide a more complete out-of-the-box experience by including browser plugins, media codecs, support for DVD playback, Java and other components. It also adds a custom desktop and menus, several unique configuration tools, and a web-based package installation interface. Linux Mint is compatible with Ubuntu software repositories. »

elementary OS is a free, fast and aesthetically pleasing operating system based on Ubuntu .

Manjaro is a user-friendly Linux distribution based on the independently developed Arch operating system. Within the Linux community, Arch itself is renowned for being an exceptionally fast, powerful, and lightweight distribution that provides access to the very latest cutting edge – and bleeding edge – software. However, Arch is also aimed at more experienced or technically-minded users. As such, it is generally considered to be beyond the reach of those who lack the technical expertise (or persistence) required to use it. »

openSUSE is a free and Linux-based operating system for your PC, Laptop or Server.

Kubuntu is an official "flavor" of Ubuntu that uses the KDE desktop environment instead of the default Unity . This gives it a completely different look and feel.

Gentoo Linux is a versatile, fast, highly configurable and completely free Linux and FreeBSD distribution geared towards developers and network professionals.

Raspbian is a free operating system based on Debian GNU/Linux and optimised for the Raspberry Pi hardware (the armhf processor architecture). Raspbian comes with over 35,000 packages, or pre-compiled software bundled in a nice format for easy installation on a Raspberry Pi.