Franz, a free messaging app/former Emperor Austria, combines chat and messaging services in one application. He supports Slack Messenger, HipChat Messenger, Telegram and WhatsApp.
Franz allows you to add each service multiple times. Franz is the ideal tool to manage multiple private and business accounts simultaneously. If you feel the need to, you can use Facebook Messenger with five accounts at once.
This software also has additional functionality, which can be purchased on the page.