Irrlicht Engine

Ued is better, but i agree, this editor is pretty damn awesome

in maya:

detach the faces you want to give a different texture to, (then UV if needed) and export as .obj, when loaded in irrEdit all is 1 object and the textures are placed correctly :)

in max:

same :)

in irredit: no idea

ps. you can do it differently probably, I just started working with this ...