3D modeling software

[shyGriff]

sketchup is much easier than blender but it's kind of fiddly and it also can't do everything blender does so you'll either have to deal with blender being confusing or deal with sketchup being limited and frustrating

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[Blocklandian¹]

You can export models from sketchup to blender using the .obj exporter.

[Axolotl2]

sketchup is much easier than blender but it's kind of fiddly and it also can't do everything blender does so you'll either have to deal with blender being confusing or deal with sketchup being limited and frustrating

Sketchup is horrible to use for Blockland IMO.

[GEN.Fire Bird]

I don't think anyone has mentioned Blender.
Seems to be a good choice.

Blender or MilkShape3d

http://www.blender.org/

blender 

Get blender

Blender all the way.

[ZSNO]

Autodesk 3DS Max
Sign up for the education community

[J MASTER]

Blender is the best free program with the most tutorials.

[TheChaosCarrier]

Just pick Blender already lol.

[Ben Grapevine]

It was a joke lol

[Ladios]

Maya is great but costs way more than Free.
I've used Milkshape back when I was modeling more and its not as functional as Maya but I like it waaaaaay more than Blender.
That's just me though, plus you only get a free trial of Milkshape, but I liked it so much I bought the full version after the trial expired.