Slack - A messaging app for teams who see through the Earth!
Samsung Flip - A 55" digital white board from Samsung
Zulip - Chat for distributed teams. Zulip combines the immediacy of real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones.
Witeboard - A real-time whiteboard for your team. No signups required.
Weet - Weet is the 1st asynchronous video messaging tool built for remote teams
Sketchboard.io - Visual Remote Teamwork. Solve problems and create ideas on endless whiteboard with your teammates by sketching.