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ISS used to, and I assume still does, let you run a scan against localhost. You should be able to register and account with them (free) and download, without the marketing crap...although I am...

Wanted to make a couple of notes/comments as well:

I've used Retina before and when it runs ok, it is pretty good, but I have had some flakiness problems from it (more on that later). Do want to...