CoSketch - CoSketch is a multi-user online whiteboard designed to give you the ability to quickly visualize and share your ideas as images. No registration or plugins required.

Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.

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.

Twiddla - Mark up websites, graphics, and photos, or start brainstorming on a blank canvas.

Facebook Messenger - Facebook Messenger is a faster way to message.