Tour Operators
- Intrepid Travel
- Abercrombie & Kent
- G Adventures
- Tauck
- Topdeck
- Globus
- GeoEx
- Butterfield & Robinson
- Audley Travel
- Oceanic Society
- Africa Adventure Consultants
- Extraordinary Journeys
- Red Savannah
- Global Basecamps
- Zegrahm Expeditions
- Insight Vacations
- Rothschild Safaris
- Viking River Cruises
- African Budget Safaris
- Go2Africa
- Siyabona Africa
- Budget Safaris Uganda
- Road Scholar
- Safari HQ
- Overseas Adventure Travel (O.A.T. Tours)
- ElderTreks
- Grand Circle Cruise Line
- CroisiEurope
- Avalon Waterways
- Uniworld
- Thomson Safaris
- Namibia Travel Connection
- Equitours
- Chile Nativo
- Explora
- Wild Planet Adventures
- Journeys International
- Sacred Rides Mountain Bike Holidays
- Pachamama Journeys
- KE Adventure Travel
- Exeter International
- Wild Frontiers Travel
- WildChina
- Hidden Places Travel
- Engaging Cultures Travel
- Belmond
- Remote Lands
- Global Volunteers
- Explore!
- Aspiring Adventures
- MIR Corporation
- Field Guides
- Access Trips
- Freewheeling Adventures
- Wilderness Scotland
- Elevate Destinations
- Tofino Expeditions
- Tasmanian Expeditions
- BikeHike Adventures
- Amazon Nature Tours
- Kensington Tours
- Cultural Crossroads
- Ecoventura
- R. Crusoe & Son
- Turgleder AS
- O.A.R.S
- Gate 1 Travel
- Whole Journeys
- Ponant
- Austin Adventures
- EverGreen Escapes
- Sierra Club Outings
- American Queen Steamboat Company
- SmarTours
- Earthwatch Institute
- National Geographic Expeditions
- Trek Travel
- AMA Waterways
- Acacia Africa
- Ultimate Kilimanjaro
- Alpine Ascents International
- Tusker Trail
- REI Adventures
- Bicycle Adventures
- World Expeditions
- Wings Birding Tours
- Quark Expeditions
- Nature Expeditions International
- Hurtigruten
- The Africa Adventure Company
- andBeyond
- Micato Safaris
- Wilderness Safaris
- Classic Journeys
- Scenic Cruises
- VBT Bicycling Vacations
- On The Go Tours
- Wendy Wu Tours
- Go Ahead Tours
- Trek America (Operations Suspended)