ReactOS®是高阶的自由开源操作系统，工程彻底地去编写实现一个兼容Microsoft Windows® XP的操作系统，务求达致完全机器码层级兼容那些给NT和XP操作系统的应用及装置驱动程式，而方法是使用相近的架构，提供等价的公用介面。
ReactOS是现有类Windows®操作系统当中最完整的工作模本。由是，在职编程师透过研究ReactOS源码、甚至参与ReactOS开发，将能获益良多。
ReactOS过去以至将来都会继续吸收更新版的功能，间或甚至断定操作系统技术的先进指标。
一句话，ReactOS目标造到用你手头上的硬件运行你手头上的软件，给所有人一个自由的操作系统！
请留意，ReactOS 0.3.5尚处于alpha阶段，意味着它功能未完全及不建议日常使用。
Changes summary
A consolidation of all changes in great details can be found in the changelog. Summing up the most important changes::- Updated bootloader (FreeLdr), with some parts rewritten for better compatibility and better code maintenance
- Memory (heap and pools) corruptions fixes throughout the whole system
- Kernel: a number of critical bugs fixed over the whole kernel, and rewrite of an early initialization part of the Memory Manager
- Win32 subsystem: overall improvements in the subsystem, involving both user and kernel mode components
- Base CRT library had key parts reworked in favor of better compatibility
- Command shell (cmd.exe) improvements, especially in interpreting batch scripts
- Font changes for better metrics compatibility
- Internationalization support improvements with a keyboard layout switcher, working Regional Settings Control Panel Applet, 1st stage setup localization into quite a few languages, and more keyboard layouts added
- Almost all kernel mode drivers and user mode applications, control panel applets, DLLs were worked on, resulting in improvements, bugfixes and more functionality
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