garden planning tool (free)
I've seen this online Garden Planner at other garden-related sites, but only as a 30 day free trial then you have to pay. This is the first time I've ever seen it available for free, so I thought I'd share.
Also, I noticed that they have what appears to be a very nice app for $4.99. It includes the software I just mentioned but has a lot of other features and includes a garden journal. I don't have a smartphone yet but have been thinking about taking the plunge and this has definitely nudged me closer to the edge of the cliff :)
Here is a link that might be useful: Free online garden planner