Dear Ender, I personally haven't come across anything that imports IGES or STEP and exports .osg directly so I think you will need to go into OSG via an intermediate file format, e.g. 3DS, DirectX, Wavefront OBJ etc. In house we use Okino Polytrans, or Solidworks (neither of which is free) but there are plenty of other tools around that will convert STEP/IGES to something like 3DS, which OSG will import and convert.
I personally like going via OBJ as it's an ascii format that is editable by hand (just) in case things go a bit awry. Depending on the models, you may get slightly different results going different routes. My experience of going via 3DS, for example, always ends up with slightly strangely flipped normals. Hope that helps, David
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