ReactOS项目致力于开发一个免费软件，向大家提供完全兼容Microsoft Windows XP的操作系统。ReactOS 旨在实现和NT与XP操作系统二进制下的完全应用程序和驱动设备的兼容性，通过使用类似构架和提供完全公共接口。
自由软件倡导者认同自由软件操作系统现状的改善促进了竞争，ReactOS也同样获益匪浅ReactOS是最完整的类 Windows®操作系统的工作平台， 因此，参与开发的程序员需要花费许多精力去学习ReactOS源码 和研究ReactOS开发文档。
ReactOS组件也越来越多，兼容性也越来越好，但 ReactOS 不会有任何束缚。 ReactOS已经并将继续吸收最新版本的Win32 API，跟踪甚至发展最新的操作系统技术 。尽我们所能，使用最新的技术，并不断的融合新的特点到最新版本。
简单地说，ReactOS目标就是用您的硬件设备去运行您的应用程序，最后，诞生一个任何人多可以免费使用的 FOSS 操作系统!
ReactOS® is an advanced free open source operating system providing a ground-up implementation of a Microsoft Windows® 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® 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!
Generic 0.3.3 Changes:
* Source tree restructure and cleanup (Alex Ionescu, Aleksey Bragin)
* Update DejaVu font to 2.18 (Magnus Olsen)
* Switch to DejaVu font in all cases, Cmd is now using DejaVu font as well, the GUI already uses it (Magnus Olsen)
* Import usp10 from Wine, CVS revision 1.8 (Magnus Olsen)
* Add a test case for a few APIs of the Win32k DirectX support, like NtGdiDdCreateDirectDrawObject, NtGdiDdDeleteDirectDrawObject, NtGdiDdQueryDirectDrawObject. The test case is not 100% correct because of different faults, so you need to check by hand why it failed in some cases. The test case works on every Windows that supports DirectX8 or higher, or ReactOS 0.2.9 or higher (Magnus Olsen)
* Change ObpDosDevicesShortName to match the ob.h header prototype (Magnus Olsen)
* Many header compatibility fixes between our DDK and MS DDK version 3790.1830 (Magnus Olsen)
* Update FreeType to 2.3.4 (Magnus Olsen)
* Create a folder called DXSDK, which contains headers that work similar to MS DXSDK 2004 December (Magnus Olsen)
* Various compilation fixes for MSVC for different modules (Magnus Olsen)
* Adapted strtoul to strtoull and add the missing error code (Pierre Schweitzer, bug #2314)
* Lots of cleanup for cross-compilation (Hervé Poussineau)
* Add a variable to change the name of the ReactOS directory on bootcd (Hervé Poussineau)
* Add a "typedefs64.h" header file, when we need 32-bit types on 64-bit x86-64 hosts (Colin Finck)
* Compilation fixes for FreeBSD and probably other Unix derivates (Colin Finck)
* Compilation fixes on 64-bit hosts using the "typedefs64.h" header, in particular for Cabman, Mkhive, Wmc and Wrc (Colin Finck)
* Compilation fixes for Mac OS X hosts (Alex Ionescu, Colin Finck)
更新：http://www.reactos.org/wiki/index.php/ChangeLog-0.3.3
截图：http://www.reactos.org/en/screenshots.html
官网：http://www.reactos.org；http://www.reactoschina.com
Installation CD – 官方下载：
With the Installation CD, you can install ReactOS on a computer.
Live CD – 官方下载：
The Live CD lets you try ReactOS without installing it on your hard drive.
Preloaded with QEMU – 官方下载：
This download includes the current version of ReactOS preinstalled on a QEMU virtual machine. A Windows version of QEMU is also bundled, so you can easily check out ReactOS.
Preloaded on a VMware virtual machine – 官方下载：
This package contains a VMware virtual machine with a preinstalled version of ReactOS.
Source Code – 官方下载：
This package contains the whole source code of this ReactOS version.
官方下载页面：http://www.reactos.org/zh/download.html
FROM LEEHARE