Has anyone tried Jami? I'd like to chip in, but I have literally nobody to use it with so no experience here, maybe it is worth looking into for you OP
F-Droid
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
Matrix space | forum | IRC
Tried it, sometimes glitchy
Haven't tried it again since 2021
Hey, that doesn't sound too bad!
I have it working with my family, and ti works quite fine. It's quite easy as well, once the accounts have all been setup...
Setting an account is not hard at all. The complexities come when wanting multiple devices getting in sync. On Android it's been rock solid for some time already. On the GNU+Linux side, depending on the distro, it might have fatal issues, or just work.
Define anon.
Apart from that, take a look at https://bkil.gitlab.io/secuchart/ and user feature (leftmost column) Video calls
for messengers with Android F-droid/apk
yes.
no login apart from user name (no phone nr / no e-mail)
Is jitsi enough?
If you're ok with Jitsi, and you already use Brave, note that Jitsi is baked in. See https://brave.com/talk/ and check the "Who provides the Brave Talk service?" question:
The Brave Talk service is provided in partnership with 8x8. And the service is built on the open-source Jitsi platform.
(Note that 8x8 owns Jitsi)
See also the "How are my calls with Brave Talk encrypted?" question:
To start, all video and audio data transferred through Brave Talk is encrypted via transport layer encryption. This is similar to how many websites use HTTPS to ensure your traffic can’t be captured on public networks (e.g. coffee shop WiFi).
The video and audio from your call are transmitted to other participants with the help of a Video Bridge server that’s run by Brave’s partner, 8x8. When you enable Video Bridge Encryption in Security Options, your browser exchanges keys with other call participants, and these keys are used to encrypt the video and audio streams. Only people with keys can see your calls. Assuming honest but curious behavior, neither Brave nor its partner, 8x8, have this key by default.
However, there are some important limits to Video Bridge Encryption. If you want to include a phone participant in your call, have more than 20 participants, or want to include users with incompatible browsers (Safari, most iOS browsers, and browsers based on Chromium version 83 or below), this encryption setting will not work. If you record a call, 8x8’s servers will receive a set of keys to decrypt the video/audio stream in order to process and store that recording. Brave will continue to improve Brave Talk’s encryption properties and work to remove some of these limitations.
Read a more detailed description of Jitsi encryption (the open source basis for Brave Talk).
So not anonymous, but pseudonymous.