Crypho - End-to-end-encrypted messaging and file sharing
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
blockslack.io - Chat for small teams — encrypted and decentralized
Echo - Golang HTTP server framework
Wire by EY - A highly secured collaboration platform
Yac - Take your time back from Zoom & Slack