Paper Planes - Relaxing web app that lets you throw paper planes with people across the world.
Tworlds - Swap photos with strangers around the world, anonymously
Twin Strangers - Find your look like from anywhere in the world.
Just a Minute - A web experiment to see how well you can estimate a minute.
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.
The Evolution of Trust - an interactive guide to the game theory of why & how we trust each other