WWOOF (World Wide Opportunities on Organic Farms) is a world wide network that connects volunteers with organic farmers. In exchange for volunteer help, WWOOF hosts offer food, accommodation and opportunities to learn about organic lifestyles. www.wwoof.org

Help Exchange (HelpX) is an online listing of host organic farms, non-organic farms, farmstays, homestays, ranches, lodges, B&Bs, backpackers hostels and even sailing boats who invite volunteer helpers to stay with them short-term in exchange for food and accommodation. www.helpx.net