Plugin for Blender would be great! Specially now when Blender's realtime renderer eevee is just coming out, it would be great to have the image straight to Millumin like from c4d.
Now that we got a great Syphon Plugin for unity (yay!) it would be great to extend this work to Blender with its real time engine EEVEE.
While Blender supports OSC input, a syphon plugin that would allow sharing the live-render with millumin is still missing.
This would be great as Blender is pretty much Cinema 4D and After Effect blended together.