Permaculture without the mysticism: what to look at, in what order, and which plants do which job. Free, and yours to print.
The full Groundwork reads the real terrain, soil, climate and sun of a boundary you draw on a map, and puts swales on the contour. That half runs on your own computer rather than on a website — it needs a live connection to the USGS, USDA and ERA5 data services, and it keeps your sites on your own disk. Ask if you want a copy.