An Open Source Windows Compatible OS
What is ReactOS?
ReactOS is an Open Source effort to develop a quality operating system that is compatible with Microsoft Windows(R) applications and drivers.
ReactOS is licensed under the GNU General Public License.
Relationship with the WINE project
ReactOS has always planned to work with the WINE project to share as much programming effort as possible.
This will mainly concern User Mode DLLs and will happen once ReactOS’s Kernel Mode areas are more complete, as those areas form the underlying infrastructure. Other areas of cooperation lie in applications and testing suites.
ReactOS project, although at present is centered in the compatibility with Windows NT 4.0, has always an eye placed in maintaining the compatibility with the future versions of Windows NT releases, like they are, Windows 2000 (NT 5.0) and Windows XP (NT 5.1).
Support for Other Subsystems
The Microsoft Windows(R) architecture allows for subsystems, as does the ReactOS architecture. A subsystem is an implementation of the APIs of another operating system, allowing ReactOS to run applications from other systems. We are already looking at subsystems for: Java, OS/2 and DOS and possibly others in the future.