Maybe too late, but here's my answer
Blender is WYSIWYG 3d models editor that let's you export your models to many different formats, including x3d (or it's older versions, VRML 1.0 and 2.0). And Wavefront OBJ, and 3DS too. It's open-source, and this is what I use.Originally Posted by Joshas
But note that implementing full x3d/VRML support in your engine is not trivial, I would suggest to start with some simpler format like Wavefront OBJ or indeed 3DS.
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