Slack - A messaging app for teams who see through the Earth!
Smart Kapp Whiteboard - Connected whiteboard that saves notes to your app
Sketchboard.io - Visual Remote Teamwork. Solve problems and create ideas on endless whiteboard with your teammates by sketching.
Jamboard - Interactive Business Whiteboard | G Suite
Smoothboard Air - Smoothboard Air is a collaborative interactive whiteboard application for iPads and Android devices that revolutionizes interaction in lecture rooms.
Witeboard - A real-time whiteboard for your team. No signups required.