Anyone know a plugin or application that emulate the Compiz Annotate funcionality in Gnome 3? Annotate is the plugin that lets you draw on the screen.
Open-Sankore it's probably your solution. It allows you to turn your computer into a whiteboard.
After that you can run Open-Sankore: When it's opened click on Show Desktop in the top-right of the screen to view your desktop with a little toolbar, so select a pen and have fun.
If you can't see anything after you clicked on Show Desktop, you probably have to change window in your workspace searching for the "Open-Sankore window".
It is gnome-shell version 3.6 now in Ubuntu 13.04, But still it has nothing similar to "Annotate" plugin in Gnome 3. I believe, there will be no alternative for that functionality in Gnome. I recommend using Compiz enabled environment like Unity, Or you can customize your own environment using cairo-dock or avant-window-navigator.