Maya Research Program - http://www.mayaresearchprogram.org/
The Maya research program provides a real-world experience for students and volunteers excavating ancient Maya ruins in Belize and Moche ruins in Peru.
http://www.mayaresearchprogram.org/

Ecological Development Fund - http://www.ecologic.org/
For biological and cultural diversity to be reclaimed, EcoLogic provides much needed training, tools and financial resources to local, indigenous groups, empowering them to strengthen their communities and protect the natural environment.
http://www.ecologic.org/

Belize Biodiversity Information System - http://fwie.fw.vt.edu/wcs/index.htm
The BBIS is comprised of textual and spatial databases that are linked. The BBIS is one of many tools used by the government of Belize, national and international conservation NGOs when evaluating species distributions in protected areas and in modeling ecological and zoogeographic affinities within Belize.
http://fwie.fw.vt.edu/wcs/index.htm

Belize Botanic Garden - http://www.belizebotanic.org/
Modestly speaking we offer you beautiful plants in a beautiful place, but we're oh! so much more. Our main work is encouraging sustainable agriculture, maintaining conservation collections and engaging in conservation education.
http://www.belizebotanic.org/

Shipstern Nature Reserve - http://www.shipstern.org/
Shipstern Nature Reserve is located in the north-eastern corner of Belize. The Reserveprotects a wide array of habitats, ranging from saline wetlands and lagoons to Yucatan tropical moist and dry forests. Of the latter, one type of dry forest is so rare that it is only is found only in four different areas on the Yucatan Peninsula, and in Belize only in Shipstern !
http://www.shipstern.org/