– Treesearch, a new database that allows access to Forest Service research publications online.

– National Alliance for Community Trees, a national coalition of organizations dedicated to the same cause – restoring community forests for the benefit of all people

–  TreePeople, the Los Angeles urban forestry non-profit
–  Friends of the Urban Forest, the San Francisco urban forestry non-profit

– USDA Urban and Community Forestry Northeast region
– Southern Center for Urban Forestry Research
– American Forests
– National Tree Trust
– National Arbor Day Foundation
– US National Arboretum
– Green Infrastructure planning and conservation resource
– Low Impact Development Center
– Center for Watershed Protection