Telegram

Telegram is a real-time chat program, similar to instant messages and IRC. Telegram offers a mobile, desktop and web client. You can install the Telegram desktop client using the KDE Discover Software Store or using the command line, which differs based on which GNU/Linux distribution you're using:

• Arch/Antergos/Manjaro: sudo pacman -S telegram-desktop
• Debian/Ubuntu/Kubuntu/KDE Neon: sudo apt install telegram-desktop
• Fedora: sudo dnf install telegram-desktop
• Gentoo: sudo emerge telegram-desktop-bin
• openSUSE: sudo zypper install telegram-desktop
• Flatpak: flatpak install flathub org.telegram.desktop

Non-libre software

Note that Telegram is not fully libre, that is why it is not officially adopted by KDE Community. All Telegram groups are unofficial. You could use Matrix channels for communication.