The Serval Mesh - It works by using your phone's Wi-Fi to not communicate with other phones on the same network.
Omegle - Omegle is one of the most popular online chat website allowing user to communicate with anyone without registration.
Briar - Secure messaging, anywhere
Chatrandom - Chatrandom provides medium to users for having chat at random with different users around the globe.
WorldChat - Meet new people around the World on WorldChat.tv, the Original World Chat since 2011.
MeowChat - MeowChat is kind of instant messaging platform that offers the fun and entertaining way to the strangers across the globe to come and interact with the other strangers like them.