Omegle - Omegle is one of the most popular online chat website allowing user to communicate with anyone without registration.
SoChat - Chat with everyone
Chatrandom - Chatrandom provides medium to users for having chat at random with different users around the globe.
Ablo - Say hello to the world
LuckyCrush - Live random video chat
chitchat - Chat Room with Selfies and Pagers (yes, pagers!)