This is a very lightweight application to make temporal annotations directly on your screen.
You can define the colour and the size of the line.
Make notes on your screen while presenting documents, teaching, or streaming.
ScreenNote allows you to add notes with simple hot keys.
Just press Command (⌘) + Alt (⌥) to begin drawing
And use Command (⌘) + Ctrl (⌃) to erase the screen
*This can be configured
You can access a Control Panel by right clicking while holding the draw hotkey pressed.
In this panel you can quickly change the size and colour of the brush and also undo/redo your actions.