ReactOS(R) is an advanced free open source operating system providing a ground-up implementation of a Microsoft Windows(R) XP compatible operating system. ReactOS aims to achieve complete binary compatibility with both applications and device drivers meant for NT and XP operating systems, by using a similar architecture and providing a complete and equivalent public interface.

ReactOS is the most complete working model of a Windows(R) like operating system available. Consequently, working programmers will learn a great deal by studying ReactOS source code and even participating in ReactOS development.

ReactOS has and will continue to incorporating features from newer versions and sometimes even define the state of the art in operating system technology.

In short, ReactOS is aiming to run your applications and use your hardware, a free operating system for everyone!

Please bear in mind that ReactOS 0.3.3 is still in alpha stage, meaning it is not feature complete and is not recommended for everyday use.

imo its a dead project.. look at the 1st post, on 2007 its alpha 0.3.x.. now its still 0.3.x.. not even out from alpha for almost 4 years 

react >> once a notorious malware found in windows, bro_act a spin of infamous brontok virus. Once infected, it will re write the registry by adding _react at the end and your HD cracked with strange sound.

LOL, I thought this topic is the one

this react is different than that react.... but if it's true that this project is dead.... poor thing... they can go very far with this.... especially when they build it from scratch.... I just have one question... how can they write codes similar to Windows 2003/XP kernel??? Microsoft open their kernel code to public???