I am in the Beeper beta. Beeper supports Matrix, Whatsapp, Signal, and Telegram, but also Slack, Discord, Hangouts, Instagram, Linkedin, Facebook Messenger, SMS

I am in the Beeper beta. Beeper supports Matrix, Whatsapp, Signal, and Telegram, but also Slack, Discord, Hangouts, Instagram, Linkedin, Facebook Messenger, SMS, Twitter, and crucially, iMessage on non-Apple devices! It is a beta but it works pretty well so far. AMA