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An unofficial and privacy-focused Facebook Messenger application.

Use the WhatsApp application on your Mac OS system.

Manage one or multiple Twitter accounts on your Mac.

Yakyak is an open source chat client for Google Hangouts.

Rocket.Chat is a Web Chat Server, developed in JavaScript.

Use the Pushbullet web app without opening your browser.

Windows

Windows Mac

Tsinghua University & Academy Online

RainClassroom

Free

Make and send teaching materials to students using WeChat.