ReactOS – Community Operating System
http://www.reactos.com/

Imagine running your favorite Windows applications and drivers in an open-source environment you can trust. That’s ReactOS. Not just an Open but also a Free operating system. Features include: 1) Lightweight – 500MB HDD and 96MB RAM; 2) From Scratch – This is not Linux mimicking Windows; 3) 9,000,000+ lines of code and growing; 4) 100+ devs have contributed along the years; 5) Styles – Classical and ReactOS Lautus styles; 6) Tons of Open Modules – From Games to Drivers: Open Source and Free; 7) Ready to Install … Download their BootCD or Download their LiveCD. ReactOS looks like Windows and nowadays is able to run many Windows applications. 6,000,000+ downloads in 100 countries and tons of references. This will be added to World Wide Web Reference Subject Tracer™. This will be added to Business Intelligence Resources Subject Tracer™. This will be added to Entrepreneurial Resources Subject Tracer™. This will be added to the tools section of Research Resources Subject Tracer™.