franz-bin : Franz is a free messaging app / former Emperor of Austria and combines chat and messaging services into one application. He currently supports Slack, WhatsApp, WeChat, HipChat, Facebook Messenger, Telegram, Google Hangouts, GroupMe, Skype and many more. ( http://meetfranz.com/ )
messenger-for-desktop-bin : A simple and beautiful app for Facebook Messenger. ( https://messengerfordesktop.com/ )
whatsie-bin : A simple and beautiful desktop client for WhatsApp Web ( https://whatsie.chat/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a rukruk
For Paludis use this rsync : rsync://gentoo.zugaina.org/rukruk-portage
If you have a problem : ycarus(-at-)zugaina.org