I'm looking for a simple solution for keeping track of where I have planted various plants over time. The most obvious solution seems to be to use something like Inkscape, which is free, and allows me to label what has been planted where, and unlike paper notes, I can make simple adjustments by 'duplicating' a layer of the drawing, adding the date, and modifying the new layer with any changes in the garden. This will allow me to go back in time and see where, for example, I had planted potatoes four years ago. The 'inactive' layers on the graphical drawing can be turned off, so I can essentially get a 2D map of the garden across time. I can then add notes to each of the graphical layer so that I can learn from previous years' mistakes and triumphs.
However, I don't want to reinvent the wheel, and I'm sure there must be people already out there doing something like this in a computerised way. I wonder if anyone can suggest either (a) a bank of graphical objects that I can dump into my Inkscape drawing to represent things like trees, paths, etc, or (b) an alternative free software that does what I'm trying to achieve even more easily..?
I'm not looking for anything too fancy (i.e. I'm not designing a garden); just a way of keeping track of what's gone where, and how well it worked in the past.