If you're looking for a true interactive garden planner, then go to The Garden Planner. It's produced online by Gardener's Supply Company. You know, the outfit who probably sends most of you gardeners catalogs every so often.
It's the most thorough interactive planner I've seen. It's for raised beds, square foot gardening...any type of garden plan or design you choose. Of course, it's primarily for vegetables. But, I suppose if you want to arrange ornamentals using the same planner, there's nothing wrong with that either.
As a follow up, here's an example of the planner in action. I did a mock up of a typical 4' X 8' raised (or mounded) veggie garden bed. I chose those dimensions because that's my typical raised bed size. You can choose whatever size you want from their drop down menu. My Mock Up.
I then clicked on "Generate My Detailed Plan & Planting Guide" for my particular garden plan and Here's My Planting Guide complete with planting/sowing/growing instructions and links to their Vegetable Encyclopedia for even further details as well as their Guide To Planting & Care
It's super easy. The only thing easier is a piece of graph paper and your own pencil. But this one comes with a bit more detailed information all in one spot instead of searching through reams of catalogs and checking online. Go for it and ...stop waiting for vague promises from vague alleged gardeners who vaguely intend to publish their vague garden software-planner. You could grow a garden, harvest your produce and put it to bed for the season by the time that happens. If ever. *grin*