There are many programs for 3d modelling.
Autodesk Maya, Autodesk 3ds Max, Modo, Cinema 4d, Lightwave, SOftimageXSI, Silo, Zbrush (this is for organic modelling really), pmG messiah, Rhinoceros, Mudbox, Wings 3d.
Hell even google scetchup would probably work, although its a bit basic.