It's a simple calendar program I wrote to replace my filofax. The idea is that for each day you have a blank area you can draw on. I just scribble notes using my horrible handwriting, so as long as I can make out what it says it's good enough and no handwriting recognition or virtual keyboards are required. It also scales a week's worth of entries to a single view.
You'll need to make a ~/.drawcal dir for the data or it'll probably crash. The drawings are only saved when changing the day, so for instance making a note and closing the program will lose the note. You can't sync it with anything. It's free under the GPL, but I'd like to hear what kind of changes you've made.