Telbee.io - telbee adds voice messaging to podcasts, websites, social media and email to easily hear from and build human relationships with your customers and community - save time, reduce frustration, and gain sales, understanding and fans
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Echo - Golang HTTP server framework
blockslack.io - Chat for small teams — encrypted and decentralized
Yac - Take your time back from Zoom & Slack
Hie Chat - Know what your friends are doing and chat without typing