Penguin OS is an Operating System made by Linus Porvalds and maintained by Larry Tux Eflipper. It is a free competitor to Doors 2008. The latest version is 2.8 and the Windowing system is at 16. The Preview version is version 2.9, and the preview Windowing system is version W17. Version 2.9 supports the x86-64 architecture, and thus supports 10GB of RAM, while x86 supports 4GB of RAM.