Apps similar to Facebook Messenger as a Sidebar include Messenger & Notifier for Facebook, which is free. Other options are Facebook Status and Messenger for Facebook. In total there are three apps like Facebook Messenger as a Sidebar for Mac, Windows and Linux.
Messenger & Notifier for Facebook is an easy way to check Messenger from your desktop machine. Clicking on the toolbar icon, renders messenger.com in a small UI attached to the toolbar popup.
See your Facebook status (New Friend Requests, Messages and Notifications) on a toolbar. Perfect for those who don't want to keep Facebook open all the time.
Messenger for Facebook lets you bring Messenger right into your browser to chat with your friends.
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