Caffeine suppresses apetite and increases metabolism, two thing that may assist in a weight loss goal. A cup of strong black coffee with no sugar should do the job, for me it also seems to assist in eliminating waste, ie it makes me want to take a dump not long after having coffee.
Not a fat 'burner' as such though, but not sure anything is a fat burner in the true sense of the word.
The most fancy weight loss supplement I have seen is 'Animal Cuts' from Universal Nutrition (they have been around since for ever), comes in a big tin, with an Animal Pack style bunch of tablets, I think there is about 5-8 (not exactly sure how many) tablets you take to support weight loss, but apparently it works best if your diet and exercise are spot on. Not sure if it works never tried it, but looks fancy.
Pretty sure it's more the diet and exercise that will do the job, but I guess having some appetite suppressants and and stuff that increases metabolism might make it a bit easier and faster.