Eco-Escuela Español
- Spanish language school in San Andrés, with a focus on cultural and ecologial issues. Describes instruction, home stays, and service projects.
- http://www.ecoescuelaespanol.org/

Journey Through Tikal
- Photos and descriptions of the ancient Maya site. Requires QuickTime.
- http://www.destination360.com/tikal.htm

Ecomaya
- Offers Spanish schools, eco-treks, and biological field work. Describes each program, along with general information on the region. Based in Flores.
- http://tikalcnx.com/

Mirador Basin
- Foundation for Anthropological Research and Environmental Studies provides information on this virgin rainforest area, including previous research projects, geography, history, and ecology.
- http://www.miradorbasin.com/

ProPetén Foundation
- Nonprofit working in the areas of environment, health, and economic development. Describes projects, and lists accomplishments and publications, with several maps of the area. [English/Spanish]
- http://www.propeten.org/

Conservation and Research in the Sierra del Lacandon National Park
- Description of archaeology (Classic Maya) and hydrology (Rio Usumacinta) projects, with information about the park and its staff, and resource links.
- http://www.sierralacandon.org

Tikal Digital Access Project at the University of Pennsylvania Museum
- Aims to make available online the archive of the Museum's archaeological investigation (1956-1970) of the ancient Maya site.
- http://www.museum.upenn.edu/tdap/

The Tikal National Park
- Describes the history and organization of the ancient city, with information on excavation projects, ecology, and travel to the region. [English/Spanish/German]
- http://www.tikalpark.com/

Volunteer Peten
- Flores. Offers Spanish instruction, home stays, and ecological volunteer projects. Describes facilities, travel, and rates.
- http://www.volunteerpeten.com/