FSX/P3D. Announced about a year ago here on ADX, a reader tipped us off to a tornado development by SimSkunkWorks. Since then, development seems to have progressed. No shots of the VC and the cockpit from the exterior is still yet to be textured. I've been chatting with the JustFlight guys and theirs is very close to release actually. I am sure that one will come first. I am planning a live interview with the JF development team soon so be sure to stick around for the details. In the mean time, check SSW's latest previews via the source link below.
Oh quick unrelated sidebar, I think VectorSimWorks has folded. Just for those that have been waiting on another update.