Rambox is a Open Source and Cross Platform messaging and emailing application that combines many common web applications into a single interface.
Instead of using multiple apps or having to use your web browser, you can access and manage all your online services from a single application. Rambox currently supports Gmail, Outlook, iCloud Mail, Skype, Steam Chat, TweetDeck, WhatsApp, Slack, Telegram, LinkedIn Messenger, ICQ, Hangouts and many other service providers, even custom services.
# Ubuntu tested
~/Downloads$ chmod -x Rambox-0.5.12 ~/Downloads$ cd Rambox-0.5.12 ~/Downloads/Rambox-0.5.12$ ./rambox