I am looking for recommendations for software for creating maths video tutorials. I already have Camtasia and Adobe Captivate to capture the screen, however I need the software for the 'virtual whiteboard'. I have experimented with a few but none of them so far have enabled me to show rotations (rotating a shape from a given point (like (0, 0) or (2, 2)). If you watch the video on youtube for 'rotations hegarty maths' - this is the perfect software solution I am looking for. I appreciate any recommendations you may have.