Explain Everything - Explain Everything is an easy-to-use design, screencasting, and interactive whiteboard tool that...
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Conceptboard - Instant Whiteboards for Teams & Projects
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Microsoft Whiteboard - The canvas where ideas, content, & people come together.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.