HQ - HQ is the wildly popular live game app where you can win real cash prizes.
Wusoup - Make new friends online. Friendly, free, karma-based chat community.
Decidr - Make better decisions with quick A/B polls
BlaBla.Cam - BlaBla.Cam is basically Omegle or a Chatroulette reimplemented with the latest web technologies. It offers a simple and lightweight user interface that works on both computer and smartphone, and which can optionally be installed as an application.
Acquainted - A simple tool to create conversational polls and surveys
LangRoulette - Join LangRoulette and practice the language you love while meeting interesting people.