What's up with this stray cat?

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There's this odd-looking stray cat lurking around my neighborhood. It's a rather timid creature, and likes to sneak into our garage to steal some food. He generally stays away from us and the other cats, though. One time I saw him peering curiously through our sliding glass door, but when I approached it, it ran away (of course). It's always nice to see it, though I'm reasonably worried. That cat has been through hailstorms, blizzards, rain, and floods, but its thick fur looks a bit dirty and messy as if it hasn't been inside of a house and groomed and taken care of. It doesn't appear as though it's starving, however. It's kind of an odd-looking cat. It has mostly white fur, with large black spots. The black spots are larger than a dalmation's, and they seem randomly placed. The back end and tail is black, and much of its ear and head are black. I can't really recall too accurately without seeing it. I'm kind of interested in helping it if it is a stray, but honestly I'm not sure if it even is abandoned or something. It might have fleas, or worse, and my family already has six cats and two dogs, so they hardly seem too overly sympathetic towards it. For some reason it doesn't seem like an outright feral cat, since it seems to hang around residential homes, but honestly I wouldn't know. Anyone have any advice? Or perhaps anyone have their own stories of stray cats? Or does this perhaps sound like your cat?