Of course comparing packages like Maya and Softimage to the like of Silo has no points and I am not looking for any comparison. I appreciate if anyone can mention some unique features and tools in any software they use as a useful tool for an artist. I guess that softwares like Maya, Max, Softimage, Cinema 4D, Modo, Lightwave, to Houdini as high-end products to freewares like Wings3D and Blender or some plug-ins and scripts have a thing or two worthy of mentioning here.
Please let's save discussing about Nurbs modeling for other topics. Hope that this thread can be a useful reference for users and developers.
Thanks for any contribution.