PingTune Music Messenger
iPad, iPhone, Android
Free
https://itunes.apple.com/app/pingtune/id716749646?ls=1&mt=8
https://play.google.com/store/apps/details?id=com.tuneit.pingtune.prod
Swarm
iPad, iPhone, Android
Free
https://itunes.apple.com/us/app/swarm-by-foursquare/id870161082?mt=8
Godzilla Smash3
iPad, iPhone, Android
Free
https://itunes.apple.com/us/app/godzilla-smash3/id847954928?mt=8
https://play.google.com/store/apps/details?id=com.rogue.smash3