Not really a game, but maybe someone enjoys the video of our Visual Attentive Presentation Agents. 
I wrote the complete rendering and animations part (as well as an exporter for Maya) the 3 month I was in Tokyo. Some information on both application components:
- they are completely written in Java using the official OpenGL Bindings.
- characters perform gestures through skelletal animations with soft-skinning (>100 bones/character)
- characters show mimics and talk with lip-synchronization through morph-targets/blend-shapes (about 30 different/character)
- rendering is very minimal: a simple diffuse shader is used for all except for the hair
- the the meshes of one character consist of >10k vertices and >15k triangles
I know it 's far from being perferct, but hey I only had 3 month :
Any comments appreciated