Malt-O-Meal counts. 
(But I didn’t care for it as much as a kid – even the chocolate kind.)
I put oats, but actually my all time favorites is Bob’s Red Mill 7 Grain cereal mix --wheat, rye, oats, triticale, barley, brown rice, oat bran and flaxseed. I get it at our local health food store, although I have seen it in infrequent trips to Whole Foods. Very filling and yummy.
I’d never heard of it before, but I just three days ago bought a bag of the 10-grain version–contains the 7-grain ingredients plus corn, soy, and millet–at my local grocery store. (I was actually looking for Roman Meal cereal, which they didn’t have.) I haven’t tried it as cereal yet; I bought it to make pancakes with.
Voted for oats - steel cut of course.
I think I’m going to have to find a semolina pudding recipe.
I love a sweet cornbread the next morning on a cold day with warm milk.
All of them. I love all of them. When we were little, we used to have Maypo, and I found it on the store shelves again a few years ago, but of course it wasn’t the same.