I am wondering is "Kromtech Alliance Corp." different from ZeoBit?
Theoretically, yes. Zeobit sold MacKeeper to Kromtech not long ago. However, it's odd that the mackeeper.kromtech.net site redirects to mackeeper.zeobit.com, rather than the other way around. Makes me wonder if this is all just a marketing ploy, and they're both owned by the same company. (I should note that that is just a question I have pondered, not anything that I have any reason to believe is true. I cannot find any evidence to support that idea.)
Since it's still the same flawed app, I'd still recommend against it. We'll see if Kromtech does anything different with it.
Lastly what do you think of DiskTools Pro? Does this app do as much or more than MacKeeper? Is it safer?
I've never used DiskTools Pro, but some of the things it does are similarly unuseful. Defragmentation, for example, is not something you should be doing frequently - or, for most people, ever - on Mac OS X, as Mac OS X does defragmatation on its own in the background as files are written to the hard drive. In general, any time someone is selling a utility that does something that is completely unnecessary, I have to question that.