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.
ChatSecure - ChatSecure is a free and open source messaging app that features OTR encryption over XMPP.
Chatib - Chatib is an online chat room where you can meet and chat with new people, make them friends, or even data them online.
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.
ChatIW - Meet and Chat with new friends around the world.
Chatingar - Chatingar.com is free chat rooms for online chat and connections worldwide. Find your perfect match and chat instantly!