Hi im new to xna and im trying to find an absolutely free 3d modeling software to use with XNA, and i came across anim8or.It looks preety good and i was just wondering do you guys think its a good modeler to make models for a XNA program?Thx.

G-Max is probably the best I can think of. It's the free version of 3DSMAX and very similar in layout so if you do start to use 3ds then you'll have a head start.

Thx(This is code shinobi.For some reason i couldnt log in as my previous made account, so i had to make a new one).

Blender. Blender is awesome. It's interface is hard to get used to at first, but if you stick with it there's no limit to what you can do with it. It rivals 3DS Max in features (and beats it in some cases), yet is completely free and open source.

People seem to be pretty much split into two camps: "I heart Blender" and "Blender sucks". The latter camp are usually the people that don't take the time to learn it's interface. I highly recommend trying it out and seeing if it works for you - there are lots of video tutorials for getting used to it, and even a book, The Essential Blender, which can greatly help you get to grips with it.

If you don't like it, some other free modelers are TruSpace (although it's being discontinued), Wings 3D, and of course XSI Mod Tool Pro.

[edit]: Anim8or is okay. If you want something similar to that, there's Milkshape3D. It's pretty cheap ($35 last I checked) and exports to about a bajillion different formats.

I agree with the above, Blender is IMHO the most advanced, free, frequently updating piece of software ever.
Check the videos over at http://www.blender.org/features-gallery/feature-videos/, if that doesn't impress you, nothing will.

Blender, or XSI Modtool.

Blender 2.49 was just released yesterday. It's free, (and free, as in there is no EULA on what you can do with your creations, unlike the free XSI tools), and doesn't require a lot of resources to use. You just download a simple ~15mb zip file and unzip it to a folder, and it's ready to go as soon as you double click on the .exe. The interface is awkward to get used to, but once you understand it, it flies.

I recommend going to vimeo and watching all the beginner blender tutorials. It's easier than reading the docs at first, because everything will click faster as you watch someone actually work with it. vimeo tends to be better than youtube for video quality.

ClanClun:

G-Max is probably the best I can think of. It's the free version of 3DSMAX and very similar in layout so if you do start to use 3ds then you'll have a head start.

I wouldn't use GMAX, it is long dead, and the 3ds engine is about version 4. If you want to move with a free solution try Blender or Softimage Mod Tool.