Lese released Transfer, an audio positioner.
Other doppler plugins have confusing controls. Other spatialization plugins are unintuitive. Transfer handles both of these problems and packages them together, as it should be.
Taking advantage of ambisonic audio, Transfer handles the processes associated with both encoding and decoding of the sound internally, without having to mess around with a bunch of variables. Transfer keeps it dead simple; audio in, spatialized signal out.
Transfer also features two different control modes; a full spherical positioner, as well as an X/Y pad representing the left/right/front/back space around the listener.
More info here: Lese | Transfer