have used it, and its great. maybe it's a bit oldschool on first sight, but its a great, customizable project.

they use https://github.com/meetecho/janus-gateway as the webrtc backend, at least according to https://opentalk.eu/en/open-source-code-und-community. so the rust part is probably just for chat and signaling.

i was really disappointed by gmail when i was forced to use it at work. i was not looking forward to use it, but i wanted to give it a chance. i don't understand why its so popular. there are so many annoying gui issues:

• new mails in a "folder" make it bold, but selecting the folder to look into the mails, also make the folder bold
• the real settings interface is hidden behind two clicks, i think i never used the settings visible after the first click...
• the "new mail" interface is a joke. i want to write a mail, not a chat..
• you have to use # to delete mails.
• you can not select multiple mails with shift, but you have to use those check boxes in the front of each line.

Sadly cadence seems to be dead: https://github.com/falkTX/Cadence

Und so sehen die Blätter der Mutter aus: