DietPi - Dietpi is a debian based operative system made to install new apps easyer.
Lubuntu - Lubuntu is a fast and lightweight operating system with a clean and easy-to-use user interface. The core of the system is based on Linux and Ubuntu. Lubuntu uses the minimal desktop LXDE, and a selection of light applications.
CRUX Linux - CRUX is a lightweight Linux distribution for the x86-64 architecture targeted at experienced Linux...
Xubuntu - Xubuntu – Xubuntu is an elegant and easy-to-use operating system. Download XubuntuXubuntu – Xubuntu is an elegant and easy-to-use operating system. Feature Tour.
TinyCore - Simple operating system based on Linux that uses "modules", and loads everything into RAM. Can be persistent too.
Ubuntu - Ubuntu is a Debian Linux-based open source operating system for desktop computers.