From RE:Vision Effects:
After Effects Plug-in that applies more natural-looking motion blur to a video sequence by automatically tracking every pixel. RE:Visions tracking technology is at the heart of ReelSmart Motion Blur, so there is no handwork involved. Users can add as little or as much blurring as is needed. For 3D animation ReelSmart Motion Blur can be used as a post process, eliminating the need for unnecessarily long render times to calculate motion blur in a 3D system. ReelSmart Twixtor works in After Effects, Final Cut Pro, Commotion, Premiere 6.0 and Combustion and other programs that support After Effects plug-ins.