Never, ever, crackers.
Otherwise it depends on the style. Beef chili with beans gets topped with cheddar, sweet onion, and sour cream. Usually nothing else but maybe with corn tortillas. Texas/all beef chili can be as the above, or with a real cornbread. (The non-sweet type that is all corn and no sugar or wheat flour.)
Pork chili depends upon the recipe. If it’s nice and fatty I like a dinner style roll, or either sweet or traditional cornbread. Maybe corn tortillas. As does white/green chicken/turkey chili; which I eat very rarely.
I don’t eat vegetarian chili. I don’t even believe there is any such thing. Gack!