MikuMikuDance allows you to import 3D models into a virtual work space. The models can be moved and animate accordingly with sound and have expressions change to create music videos.
Originally developed by programmer Yu Higuchi (HiguchiM) for the Vocaloid(singing voice synthesizer) character Hatsune Miku. Users can now import their own 3D models or download the models created by others. MMD is now being supported by fans of the software at VPVP.