Franz 2.0 is a desktop app that puts messaging services altogether in one place. It can combine apps like WhatsApp, Slack, Facebook Messenger, WeChat, HipChat, Skype and a lot more. You can even use multiple accounts for the Facebook Messenger - mix your business profiles and your private ones if you need to.
Franz is your open source messaging app for WhatsApp, Facebook Messenger, Slack, HipChat, Telegram and many many more.
Telegram X is an official alternative Telegram client built in Swift, with higher speed, slicker animations, themes and more efficient battery use.
Tweeten is a column-based interface that helps you keep track of everything that's happening on Twitter without needing to hit the refresh button.