I use Territorial Seeds garden planner. It is $35 per year for the online version. But I can draw out my three raised beds and it tells me how many of each vegie I can plant, irrespective of what I might want. I do the square foot gardening thing but it would would for your row garden also. In other words, it tell me how many of each kind of vegie I can reasonably plant in the area I have. I tended to way over plant which encouraged fungus and rot as the plants were too close together.
On the other hand, just looking up each vegie online will tell you about spacing and such. Then you plant what grows well in your area, and what you like. In the case of tomatoes, which I can't seem to grow in our cooler climate, I would have planted many so I could can them for sauce.
