Our “Watch” series of articles continues today with a very interesting one where you can see Mac OS X 10.4 Tiger running inside the ReactOS computer operating system, which we believe has come a long way, and it’s beginning to look like a viable alternative to Microsoft’s Windows 7 or Vista operating systems, perfect for desktop computers and laptops. The latest release, ReactOS 0.4.8, showed us last month that it’s now possible to use Windows 10, Windows 8, and Windows Vista software on the free and open-source operating system that’s binary compatible with computer programs and device drivers made for Windows.