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.
Darwin is the Open Source operating system from Apple that forms the basis for Mac OS X, and PureDarwin is a community project to make Darwin more usable (some people think of it as the informal successor to OpenDarwin.
Karoshi provides a simple graphical interface that allows for quick installation, setup and maintenance of a network.
Ubuntu Cloud is an open source Linux operating system designed to be used as a personal cloud server. It is based on the well known Ubuntu Linux distribution and recognized as an official Ubuntu flavor, distributed by Canonical.
BeeFree OS is inspired from Ubuntu, Windows 7 and Linux Mint. The name is acronym for Beautiful, Effective, Efficient and Freedom.
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GNU-Darwin aims to be the most free software distribution. Our mission is two-fold: Focus on projects that leverage our unique combination of Darwin and GNU, and help users to enjoy the benefits of software freedom.
ULinux is based on openSUSE, and is a free linux distribution with the aim of combining the DIY-approach of Arch with the setup of Ubuntu.
Visopsys (VISual OPerating SYStem) is an alternative operating system for PC-compatible computers, written “from scratch”, and developed primarily by a single hobbyist programmer since 1997.
miniBSD is a project to develop a set of scripts that shrinks a running FreeBSD system to a small sized miniBSD distribution suited for small media like USB pens and CF cards.
eComStation is an operating system based on IBM OS/2 that runs on current hardware.
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