Caprine

Caprine is a free and open-source desktop Facebook Messenger application that allows users to chat with friends and family without the need for a web browser. With Caprine, users get a sleek and user-friendly interface that supports all the features available on the Facebook Messenger web platform, including group chat, video calls, emojis, and more. The app is built on Electron, a popular framework for developing cross-platform desktop applications, and is available for Windows, Mac, and Linux.

Caprine offers a range of customization options, including the ability to set chat notifications, themes, font sizes, and more. Users can also filter out unwanted chats and specify when they are available to receive messages. The app comes with several security features, including local data storage, end-to-end encryption, and a password lock. The app is free to use and doesn't require any additional subscriptions or fees. So whether you're a casual user or a power user, Caprine is a great way to stay connected with your Facebook friends and family from your desktop.