Omegle - Omegle is one of the most popular online chat website allowing user to communicate with anyone without registration.
Pushbullet - Pushbullet - Your devices working better together
Chatrandom - Chatrandom provides medium to users for having chat at random with different users around the globe.
Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
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.
Gotify - a simple self-hosted server for sending and receiving messages