telegram-desktop : Official desktop client for Telegram ( https://desktop.telegram.org https://github.com/telegramdesktop/tdesktop )
viber : Free and secure calls and messages to anyone, anywhere ( https://www.viber.com/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a mim
For Paludis use this rsync : rsync://gentoo.zugaina.org/mim-portage
If you have a problem : ycarus(-at-)zugaina.org