ah - that means half of my answer to you in other thread about changing the texture name in 3dsmax wasn't going to be any use.....
no there isn't a free 3d modelling tool that you can use to export models in the right format for RTW (verc's script doesn't export from gmax only import)
you can save from gmax and get someone who has 3dsmax to open and re-export it for you if you can find someone (or get your models mainly sorted out and use the 30day trial of 3ds to do it yourself)
If you move onto modelling for M2tw you can use Milkshape3d for most things which is much, much cheaper (about $30 ish)
(I'm starting to feel quite sorry for the poor Julii in your mod!)
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