Multimodal-space-shooter is a project mainly written in C++ and C, it's free.
A space shooter game using the SFML library and featuring multimodal user interactions (gesture with Kinect and voice)
Space shooter using a multimodal user interface The game uses these two modalities:
Developped for the course "Multimodal Interfaces" at the College of Engineering and Architecture of Fribourg, Switzerland
The game uses the SFML library: http://www.sfml-dev.org/