No supplement, in my opinion, can transform a physique as much as a diet can. Diet alone will have more impact that a poor diet with a supplement. After, that, there are many supplements that I have used in the past, with a proper diet, that I have think helped with my goals. Those include:
Alphamax
ArA
Ergotest
Ergobolic
Drive
APE
Everyone is going to respond differently to supplements. Also, there are several on my list I have not tried that I would love to in the future.