Messenger for Mac Turns Facebook Messenger Into an App
Mac: The new Facebook Messenger browser app is great , but if you prefer a more standalone app, Messenger for Mac is just what you need.
Messenger for Mac simply extracts the Messenger web app and turns it into a dedicated app. It looks just like Messenger, but it works on its own without having to open a browser. It’s also free and open source, so you can tinker with it however you want.
Messenger for Mac (free)