I was a wwoof host for quite a few years, and voted an excellent host. I currently need help to set up new syntropic areas and maintain and improve work I have done in the past.
Organic/Biological methods we use
Some swales and berms in contour, bananas, sugar cane, and various fruit trees planted. They are mainly on their own with mulch and chop and drop occasionally.
No external inputs ( a couple of minor exceptions).
Worm farm and compost heaps and onsite wood chips and logs are main helpers for the soil.
Small tractor with central mower and ride-on mower with catcher are my main assistants.