Paper Planes - Relaxing web app that lets you throw paper planes with people across the world.
KaraFun - KaraFun is the best online karaoke. Over 35,000 karaoke songs, with studio quality, at home or on the go. Regular updates. Free demo!
Twin Strangers - Find your look like from anywhere in the world.
Yokee - Karaoke to YouTube videos
Twins or Not - Twins or Not is a decent and innovative application that allows you to compare your photo with other images and see if they match.
Sing! Karaoke by Smule - Karaoke with your favorite celebrity singers