Planeta.com
- Virtual library archiving articles about ecotourism and conservation. Includes contacts and bibliographies.
- http://www.planeta.com/

Responsibletravel.com
- Lists eco-friendly holidays with search by country and activity, and links to individual operators.
- http://www.responsibletravel.com/

Eco Tour
- Directory of ecotour operators with search by country or keyword.
- http://www.ecotourdirectory.com/

Earthfoot's Ecotour Posterboard
- Provides worldwide links to local guides for personalised eco-tour experiences.
- http://www.earthfoot.org/

Big Volcano Ecotourism Resource Centre
- Comprehensive directory with worldwide links about ecotourism practice, ecologically sustainable development and general tourism and travel best practice management.
- http://www.bigvolcano.com.au/ercentre/ercpage.htm

Ecoturismolatino
- Guide to protected areas in Latin America, with suggested itineraries and contact information. [English and Spanish]
- http://www.ecoturismolatino.com