Big Fat Canvas is a free, ad-free (in my experience so far) drawing app optimized for use on Android tablets running Honeycomb. Big Fat Canvas allows you to draw free-hand on your Android tablet. The app offers some good options for altering the size, color, and opacity of the lines you draw. The drawings you create can be saved to your tablet or saved in your Dropbox, Picassa, and Evernote accounts. You can also share your drawings via email and various social networks like Twitter and Google+.
Big Fat Canvas could be a good free Android app for students to create sketches and free-hand mind maps to outline or demonstrate concepts. Over the years I’ve tried a variety of templates for creating mind maps, yet I always come back to drawing them out free-hand. If you have students who think the same way that I do, Big Fat Canvas could be a great app for them.