The drawing mode provided by zoomit is wonderful during a presentation. Is there any software on Ubuntu that provides the same functionality?
If you have Ubuntu, you should have
Plugin Anotate - drawing on the screen.
Plugin Enhanced Zoom Desktop - does that zoom.
Set-up shortcut as you like and enjoy. :)
Check out "Shutter". It's in the repos. It's basically a screenshot tool that lets you draw on the image with a built in tool, upload them directly to various sites, etc.