wattOS is a stunning example of really great things coming in small packages. wattOS is a lightweight and fast desktop Linux distribution based on Ubuntu 16.04.1 LTS built around the LXDE. It uses the lightweight Openbox window manager as its default user interface. To credit this 8-year-young community of developers with birthing an energy-efficient Linux distribution is an understatement. It has phenomenal performance on older hardware that lacks resources. It installs on computers with as little as 192 MB to 256 MB of RAM.