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Yakyak is an open source chat client for Google Hangouts.

An unofficial and privacy-focused Facebook Messenger application.

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

Use the Pushbullet web app without opening your browser.

Manage one or multiple Twitter accounts on your Mac.

Use the WhatsApp application on your Mac OS system.

Windows

Windows Mac

Seimet Software

LinkByLink

Free

One of the most established link checkers and HTML validators.