Chatib - Chatib is an online chat room where you can meet and chat with new people, make them friends, or even data them online.
Element.io - Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.
Kandan - Open Source private chat server. Your own private Chat server in minutes, plus additional features.
Chattusa - Chattusa is a social network website that provides a free chat service and lets you connect with people from the USA without any hassle.
Shick.me - Free online chat
Omegle - Omegle is one of the most popular online chat website allowing user to communicate with anyone without registration.