Apps similar to WattOS include Linux Mint, which is free and open source. Other options are Ubuntu, Debian, Fedora and Arch Linux. There's no shortage of Operating Systems like WattOS, with more than 100 alternatives for Linux, self-hosting, Windows, Mac and the web.
Debian-based Linux OS emphasizing beauty and efficiency. Uses KDE Plasma 5, AppImages, and OpenRC instead of systemd. Integrated with Maui Apps and Liquorix kernel for high responsiveness. Includes Firefox, NX Software Center, comprehensive app suite, and hardware probing.
Mexico
Bodhi Linux, a lightweight distribution featuring the fast & fully customizable Moksha Desktop (https://alternativeto.net/software/moksha/about/). The 64-bit is built on top of Ubuntu (20.04). The 32-bit Non-PAE architecture has a Ubuntu 18.04 base – Bodhi Linux 6.0.
SparkyLinux is a Debian-based Linux distribution which provides ready to use, out of the box operating system with a set of slightly customized lightweight desktops.
SliTaz is a free operating system, working completely in RAM and booting from removable media such as a CD-ROM or USB key. SliTaz is distributed as a LiveCD, and weighs less than 40MB. The system is quick and responsive, clean and robust.
Switzerland
ALT Linux is a set of RPM-based, APT-managed operating systems built on top of the Linux kernel and Sisyphus package repository branches. ALT Linux Rescue is, well, the disaster recovery tool.
Russia
A purely functional package manager and an advanced distribution of the GNU operating system developed by the GNU Project—which respects the freedom of computer users.
NomadBSD is a persistent live system for USB flash drives, based on FreeBSD. Together with automatic hardware detection and setup, it is configured to be used as a desktop system that works out of the box, but can also be used for data...
Germany
EU
Endless OS is a Linux-based operating system which provides a simplified and streamlined user experience using a customized desktop environment forked from GNOME 3. Rather than using a traditional Linux package management system, Endless OS uses a read-only root file system...
United States
antiX is a fast, lightweight and easy to install systemd-free Linux live CD distribution based on Debian Stable for Intel-AMD x86 compatible systems.
Ubuntu Kylin is an official Ubuntu subproject whose goal is to create a variant of Ubuntu that is more suitable for Chinese users using the Simplified Chinese writing system.
China
Edubuntu is an Ubuntu-based operating system that's designed for educational use in schools and other educational institutions.
United Kingdom
MenuetOS is an Operating System in development for the PC written entirely in 32/64 bit assembly language. Menuet64 is released under proprietary license and Menuet32 under GPL. Menuet supports 32/64 bit x86 assembly programming for smaller, faster and less resource hungry...
