Snarl - Snarl is a notification system for Windows.
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.
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
Chatib - Chatib is an online chat room where you can meet and chat with new people, make them friends, or even data them online.
Hubgets - Chat, voice, and video turning team communication experience into knowledge to help your business get more productive
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.