How could I not know that such a cool product existed..until yesterday when I read about them being acquired by Google?! I tried out Flutter yesterday, and it definitely, is a remarkable idea put into being. Kudos to the team!
PS: Using Flutter app you can control various applications on your PC/Mac using you hand-gestures -- changing songs in a media player for instance.
Update (Oct/10): OK, after about a week of usage -- I still feel it's a cool product. Just that the
camera motion-detection is a bit too sensitive IMHO -- I end up switching the song whenever I touch my face/hair. ;)