Yac - Take your time back from Zoom & Slack
Digsby - Tagged makes it easy to meet and socialize with new people through games, shared interests, friend suggestions, browsing profiles, and much more.
Echoes - Voice-first messaging for fast & collaborative remote teams
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
WebRTC - WebRTC is a free, open project that enables web browsers with Real-Time Communications (RTC) capabilities via simple JavaScript APIs. The WebRTC components have been optimized to best serve this purpose.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.