These are nonprofit organizations who can provide GIS consulting services to land trusts:

• GreenInfo Network (based in California, but works nationally)
  
• CommEn Space (based in Seattle, WA - no longer functioning, but web site still has good information)
  
• EcoTrust (Pacific Northwest)
  
• Alaska Conservation Foundation (Alaska)
  
• SAFC (Southern Appalachian Forest Coalition)
• Conservation Management Institute (Virginia, mid-Atlantic)
  
• The GIS Center (New Jersey area)
  
• Northwest Habitat Institute (Pacific Northwest)
  
• Canaan Valley Institute (West Virginia)
  
• North Carolina Coastal Land Trust (North Carolina and Southeastern US)
• Center for Community GIS (based in Maine, but works regionally and internationally)
• BioGeoCreations Private firm, but focuses on supporting non-profits.(formerly of North Carolina, now in New Mexico focusing on West).
  

Other land trusts or associations that provide GIS services include:

The Natural Lands Trust (PA-NJ)