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.
Zoom Background - 1000+ free crowdsourced background images and videos for your next meeting.
Conceptboard - Instant Whiteboards for Teams & Projects
RemoteTeam - Remoteteam.com helps remote teams become great places to work with the fully-integrated platform to automates payments and HR tasks.
Twiddla - Mark up websites, graphics, and photos, or start brainstorming on a blank canvas.
Zoom Exotic - 100+ video backgrounds for Zoom