ReactOS Homepage - Frontpage The ReactOS project is dedicated to making Free Software available to everyone by 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. with dedicatedeveryonefreelinuxmakingprojectreactossoftwareby 9 users