I like to automate the calculations, analysis, and plain old remembering what has happened in the garden.
Some of the challenges in my garden is knowing when it's too late to planting something, if it will cope with the weather conditions here, and working out what is killing the tomato. The broccoli went into the on seed, I think because it was planted too early.
Remembering what I planted where, to properly crop rotate, would be useful.
I've mostly been a summer gardener, so knowing what to plant for successful winter gardening would be great.