I'm looking for teleconferencing software. While the audio (and video) are usually trivially solvable by Skype, I have problem finding software that would let me share "whiteboard" that all parties could write on, while teleconferencing.
The problem is - neither of us (people who will be teleconferencing) is using Windows - it's only Mac OSX and Linux environment.
Any tested solution that works? Preferably free, but purchase is not impossible.