https://telegram.org/
https://web.telegram.org/
https://desktop.telegram.org/

https://github.com/telegramdesktop/tdesktop

https://wiki.archlinux.org/index.php/Telegram
https://wiki.archlinux.org/index.php/Telegram_(%D0%A0%D1%83%D1%81%D1%81%D0%BA%D0%B8%D0%B9)

community
    telegram-desktop
aur
    telegram-cli-git