NoteBookCast - A real time shared whiteboard in your browser, teach, explain, sketch. For work, study, fun.
Swipes - Plan projects, take action and discuss.
IDroo - A shared whiteboard for use by multiple Skype-users simultaneously. Features
RemoteTeam - Remoteteam.com helps remote teams become great places to work with the fully-integrated platform to automates payments and HR tasks.
Conceptboard - Instant Whiteboards for Teams & Projects
ApproveIt for Slack - Get approvals in minutes, not days. Right from Slack!