Not exactly the same, but SmoothTeddy is cute and free: http://www-ui.is.s.u-tokyo.ac.jp/~takeo/java/smoothteddy/index.html
ZBrush is great and well worth the price, but it really requires some additional software (for low poly modelling) to be useful for game graphics.
ZBrush is great and well worth the price, but it really requires some additional software (for low poly modelling) to be useful for game graphics.