Linux in use here...

SliTaz Linux is a mini distro that has a very small imprint. Comes from Switzerland.

Slackware Linux is awesome! It has been around for somewhere close to 25 years. It is the oldest distribution that is still maintained. It offers many desktop choices. Many other distros are based on it. 

Slackel Linux is a Slackware based distro. Comes with a KDE desktop and hails from Greece.

siduction Linux is a Debian (unstable) based distro. It offers various desktop choices. It comes from Germany.

Semplice Linux is a Debian (unstable) based distro which uses the OpenBox desktop. It comes from Italy.

Oz Unity (code name Sapphire) s an Ubuntu based distro. It comes from Australia.

SELKS is a Debian based distro made by Stamus Networks. It is designed for network security. It comes from France.

Sabayon Linux is based on Gentoo. It offers several desktop choices. It comes from Italy.

SalentOS is a Debian based distro. It uses the OpenBox desktop. It comes from Italy.

Q4OS is a Debian based Linux distro. It comes from Germany.