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Worth mentioning: https://www.beeper.com/

Essentially a Matrix-powered service focused on bringing a ton of inboxes. I've heard it's great, but never tried it myself.

https://element.io/element-one -- I'm using a Matrix Signal bridge (meh, it bugs quite often, kicks me out, doesn't properly update keys when people get a new phone). Also does not support calls etc.

Not currently open to sign up. :( I’ve joined the queue to get an account though

I joined the queue over a year ago and have yet to receive any communication about signing up.

This is what I do too. Sadly, there's no good call support which prevents me from uninstalling the relevant apps entirely, but all messengers pipe through Matrix now.

I'd much rather see people move to Matrix (or Signal, I suppose) than to keep having to use WhatsApp but that's a pointless fight I will never win.

Unfortunately, setting these up requires you to have a spare server at home.