Ok as of now there are a couple so called Activaitors going around the interwebz. The first is the usual fake ones that are viruses. Next are the Korean ones which try to replace the activation system completely with the windows 7 one and then activate. My personal favorite as its so sloppy it makes me want to laugh my ass off. And Lastly there is the legit one which is the microKMS which only works on Windows 8 and not Server 2012 at this point. I'm not going to list Pre-cracked ISO's as those really are not ready at this time to be completely honest.