Attached Link: http://www.eurus.dti.ne.jp/~masasi/PROGRAM/PAE.html

Not really for hair but there is an external program to work with gravity, so it can be applied to everything (at least I saw Kozaburo's ponytail hair work with this program). The only problem is there's a few stuff made for this program (or I don't know, because I can't read Japanese) please check thier webpage for more.