L5 && telegram-cli / telegram-desktop

Also you can use https://web.telegram.org as GNOME Web application. It supports desktop notifications.

  1. Go to https://web.telegram.org via Web (Epiphany browser)
  2. Click Install Site as Web Application…
  3. Confirm and wait a few sec, the application will be installed as GNOME Web Application

https://help.gnome.org/users/epiphany/stable/browse-webapps.html.en

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