Jitsi is an alternative that works fairly well.

If you want privacy-friendly, you really do want something that's open source. Jitsi is probably your best bet.

I really like Jitsi Meet and use it for any video conference calls. And Signal for one on one calls with friends and family.

Jitsi, perhaps matrix (element), signal (has tell number) works too. Threema also added video into it.. and an unpopular one brave (has it without signing in, within the browser)

If you're good with mega corps like Zoom, then I'd say Google Meet has been perfectly fine for us as a company. There's also Microsoft Teams.

If you're looking for something to use on a personal level and not corporate, then you've got pick of the litter.

@privacyfalcon9899 I've been using https://meet.coop/ for nearly 2 years, find it better than Zoom. Runs on BigBlueButton.

It seems that the user deleted his tweet. https://mashable.com/article/zoom-use-calls-train-ai-artificial-intelligence

Wire is open source and e2ee

Jitsi seemed okay to me

For the FOSS stuff Nextcloud talk, OpenMeetings, and Briefing seem to be the other ones people have not mentioned. Not used any of them. Nextcloud seems interesting if you already use Nextcloud for other things.

Frankly I would personally look at Jitsi Meet, or Wire. I have used Jitsi Meet a year or two ago. I did not find it as stable as Zoom on my setup. I liked it in every other way. Also it uses WebRTC in the browser which means that the browser needs to be configured to use WebRTC and some browsers have typically worked better then others. I do not think Jitsi Meet is e2ee though. I mention Wire because it may be e2ee (check). BigBlueButton is pretty well known too but I have never used it. Keep in mind not many conferencing solutions are e2ee.

Element/Matrix is the other tech I hear people talk about a lot. Not sure it is really a meeting alternative though.

https://meet.livekit.io

nextcloud talk can also be an alternative (open source and self-hosted).

but I think the whole nextcloud suite is more suited as a hub for a (small?) business, not necessarily great for, lets say, family videocalls (due to the necessity of having an administrator who runs it).

What announcement? Your Nitter link doesn't work

Proton Mail uses PGP which depends on which cipher both recipient and sender, sharing PGP keys are also problematic. PGP doesn't encrypt subject line but Tutanota does. Tutanota uses AES-128 and RSA-2048 for their encryption and uses AES-128 for external encrypted email which Tutanota and Proton Mail also supports.

Might want to run down through the standard list by popularity and choose based on your needs: https://alternativeto.net/software/zoom-cloud-meetings/

Keep in mind Signal can do some conferencing too. So look at some of the real time communication tools tool at https://www.privacyguides.org/en/real-time-communication/ .

Thing about conferencing is a lot of the large conferencing tools are not that secure in terms of full end to end encryption and they generally need a lot of infrastructure to support a lot of people so there is a question of who runs it and who pays for it and who secures it.

I will be interested in what others say.

Subject lines and recipient/sender email addresses are encrypted but not end-to-end encrypted for Proton Mail.

Tutanota first use the user password to generate an AES key using BCrypt, that AES key is then used to encrypt the private key. The encrypted private key and hashed AES key is then sent to the server, hence the server does not store nor know the private key and the hashed AES key is used to authenticate the user. It uses SHA256 for hashing, it's safe because the hashing algorithm is one way only and not reversible, meaning you can't convert the hash to the password but only the other way around the password can generate the hash, so even the server is compromised it doesn't gain access to your password.