Mustard, vinegar (some balsamics I've seen have sugar/calories). Anything else? I know that eating food isn't supposed to be fun on a diet, but you can't argue with sugar free/calorie free/salt free spices, can you?
Ranch dressing on EVERYTHING... Ive even got some in a mini fridge next to the bed I rub on the misses on special occasions. Yep, I know, not cal free or fat free, but Im a fat kid and thats straight up how So Co gets down.