Oblong's G-Speak is a project from a new line of research at the MIT Media Laboratory.
According to Oblong the g-speak platform is in use today at Fortune 50 companies, government agencies and universities. A software development kit that runs on both Linux and Mac OS X is available. Applications are source-compatible across both operating systems and can run on ordinary desktop and laptop computers in addition to gesturally-equipped g-speak machines and clusters.