Tabula Rasa simulates a classic blackboard. Chalk and sponge included! You can draw with chalk (making the typical sounds)and wipe away your creations with the sponge (double click to speed things up). Your drawings are always visible on the Dock-Icon, even if you quit the app.
What's new in Tabula Rasa
Function to save drawings to the Desktop
Stick to Desktop feature improved (now above the Desktop icons)