I think it is, but note that:1. ReactOS is in an early alpha stage, barely usable. It's not recommended for actual use.
2. Most Windows binaries you'll find are compiled with MSVC, which is proprietary, so there is a potential for malicious code to be introduced that way. To get around this risk, you would need to compile everything yourself with a free compiler.
3. Windows is not particularly well-designed. :) No package manager, in particular.
