Just wondering what are the alternatives to rolling Fudge dice. I know there are 4dF, and 1d6-1d6. I've seen things like 4d4 (where 1=-1, 2-3 =0 and 4 = +1. I saw a d100 system on the FATE wiki, and FATE 2e had some dice pool mechanic that reminded me of d6. What else is out there, and how do they work?