WINE and Reactos are a bit more complicated than an alternative. ReactOS is nothing more than (arguably pre-)alpha software. It's not possible, at this stage,

WINE and Reactos are a bit more complicated than an alternative. ReactOS is nothing more than (arguably pre-)alpha software. It's not possible, at this stage, to predict when and if it will ever reach sufficient stability and security. If you follow the project closely, you will realize how complex an O/S is, and how fundamentally it needs big backing (which it doesn't have) to reach maturity. WINE is not an alternative to an O/S. Specifically, it's a layer which needs to be evaluated on a per-case (application) basis; it's not (and it's not meant to be) a universal solution (which an O/S needs to be). Of course, ideas about tweaking WINE instead of fully porting software (see Carmack) are interesting, but again, that wouldn't make it a generic replacement.