OpenBoard - The OpenBoard software is an interactive white board software.
TubeChop - TubeChop allows you to easily chop a funny or interesting section from any YouTube video and share it.
Conceptboard - Instant Whiteboards for Teams & Projects
YouTube Time! - Is there a way to link to a specific part of a YouTube video? Yes.
Scribblar - Scribblar is a free online collaboration tool that is perfect for online tutoring.
Vibby - Create + share highlights from any video in seconds