Permaculture is the conscious design and maintenance of agriculturally productive systems which have the diversity, stability, and resilience of natural ecosystems. It is the harmonious integration of the landscape with people providing their food, energy, shelter and other material and non-material needs in a sustainable way. From Graham Bell's The Permaculture Way

Permaculture Institute
International Institute for Ecological Agriculture
Urban Farm Family on Permaculture
Small Farm Permaculture
La’akea Community
Punta Mona Center for Sustainable Living and Education