Franz - Free messaging app for services like WhatsApp, Slack, Messenger and many more

Franz is a messaging app that combines chat & messaging services into one application. Franz currently supports Slack, WhatsApp, WeChat, Facebook Messenger, Telegram, Google Hangouts, GroupMe, Skype and many more. Franz allows you to add each service many times. This makes Franz the perfect tool to manage multiple business and private accounts all at the same time. You could even use five different Facebook Messenger accounts at once, if some inexplicable reason urges you to do so.