[DEVELOPMENT HAS BEEN DISCONTINUED] MMDAI was a fork project of MMDAgent and VPVM a.k.a. MMDAI2 was an application to create a motion compatible with MMD for OSX/Linux that is extended from MMDAI
The development of MMDAI/VPVM has been discontinued.
If you find the alternative of MMDAI/VPVM, it will be nanoem. (Japanese page)