XMMP has mostly been superseded by Matrix these days. Not sure why, but I admit that Matrix is slightly easier to use with the same advantages as XMMP has.

Briar. https://briarproject.org
But is does not have many users yet.

Sorry, working with M$ people... so my vote is Teams. (Not because I want to)

So don't vote for it!
"Application of the Year" doesn't necessarily mean the one you use most.

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I use google meet just because that's the official choice of my institution. I use zoom with some difficulty with others.

Today, I just unlocked a major achievement and got audio/video calls (DTLS-SRTP) working with someone who resides behind a nation-wide firewall that blocks many message services.

• Server: Raspberry Pi running Prosody on Debian GNU/Linux (and lighttpd for updating LetsEncrypt certificates)
• Clients: Conversations.im on Android/Linux

Until today, we "only" had working end-to-end OMEMO encryption in both private and group chat.

It turns out that audio/video calls are being routed directly between the clients over UDP, after they have agreed on an encryption key and exchanged addresses over the secure XMPP connection. The server will not see the audio/video packet stream at all; the calls are a feature of the client, not part of XMPP itself.

If either party is behind a NAT router that would not translate UDP traffic, the audio/video chat simply would not work at all. As soon as I disabled my phone's WLAN connection to the NAT router, it switched to the mobile data connection with a public IP address, and the calls just worked.

Why do we really need proprietary things that are not even end-to-end encrypted, like Zoom, Slack, or Teams? And why are not more companies paying the likes of conversations.im for a hosted service? Is it just because the corporate PHBs never got fried for buying the IBM of the day?

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Team network for state employees is based on matrix in France.

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IRC

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We host 700+ people zoom meetings at least every month and it works superbly. Even with webcams.

As opposed to what? Smartphones?