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Use the Pushbullet web app without opening your browser.

Use the WhatsApp application on your Mac OS system.

Yakyak is an open source chat client for Google Hangouts.

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

Manage one or multiple Twitter accounts on your Mac.

An unofficial and privacy-focused Facebook Messenger application.

Windows

Windows Mac

Alexey Subbota

Multiplication table

If you want your child to learn the multiplication table by heart...