Orionflame is also pretty cool, and free to boot. Emre is very open to suggestions, has provided me with new free tools very quickly. http://www.flamefx.com/
hawken: Well, a lot of it looks like just chaff, but the tools for selecting limited edgeloops/rings, as well as the "FlowConnect" tool look nifty. Well, and of course the half of the tools that are already in Wings3d. Select Identical can actually be pretty useful
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Noice!!
http://www.flamefx.com/