Chatib - Chatib is an online chat room where you can meet and chat with new people, make them friends, or even data them online.

Voxer - Turn your phone into a Walkie Talkie. Don't waste time on phone calls and voicemails.

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.

NextPlane - NextPlane offers cloud-based, scalable unified communications federation service for the enterprise.

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.

Sameroom - Chat interoperability-as-a-service