britannica.com - Encyclopaedia Britannica
dictionary.com - Dictionary.com
etymonline.com - Online Etymology Dictionary (word origins)
merriam-webster.com - Merriam-Webster dictionary (webster.com now goes here)
plato.stanford.edu - Stanford Encyclopedia of Philosophy
wikipedia.org - Wikipedia (free encyclopedia)
wordorigins.org - Wordorigins.org (word and phrase origins)
history.com - HISTORY (historychannel.com now goes here)
historyplace.com - The History Place (U.S. and world history)
house.gov - U.S. House of Representatives
usa.gov/presidents - USAGov: presidents, vice presidents and first ladies
usconstitution.net - USConstitution.net (the U.S. Constitution explained)
whitehousehistory.org - White House Historical Association presidents timeline
archive.org - Internet Archive (free books, movies and the Wayback Machine)
archives.gov - U.S. National Archivesencyclopedia.netnz.com - Glass Encyclopedia (glass art and collecting)
gutenberg.org - Project Gutenberg (free ebooks)
loc.gov - Library of Congressloc.gov/collections/alexander-graham-bell-papers - Alexander Graham Bell Family Papers (Library of Congress)
si.edu - Smithsonian Institution
education.nationalgeographic.org - National Geographic Education
jason.org - JASON Learning (STEM curriculum; jasonproject.org now goes here)
nasa.gov - NASAspaceplace.nasa.gov - NASA Space Place (space science for kids)
coursera.org - Coursera (online courses from universities)
ducksters.com - Ducksters (history, science and geography for kids)
edx.org - edX (online courses from leading universities)
khanacademy.org - Khan Academy (free lessons for every grade)
learner.org - Annenberg Learner (teacher videos and courses)
ocw.mit.edu - MIT OpenCourseWare (free MIT course materials)
pbslearningmedia.org - PBS LearningMedia (free classroom resources)
bullfrogfilms.com - The Mystery of Chaco Canyon (documentary, Bullfrog Films)
cultura.udg.mx - Cultura UDG (University of Guadalajara culture, Spanish)
nps.gov/chcu - Chaco Culture National Historical Park (National Park Service)
pantheon.org - Encyclopedia Mythica (mythology, folklore and religion)
webexhibits.org - WebExhibits: the Chinese calendar and zodiac