网站简介：A free encyclopedia built collaboratively using Wiki software. (GNU Free Documentation License)..
网站简介：Children's BBC channel, featuring competitions, quizzes, fun and games, cartoons, chat, listings, information about presenters and celebrities. Available on Sky, Telewest, NTL and Freeview.
网站简介：Organization presenting poems, essays, biographies and photos of poets, historical and thematic poetry exhibits, events calendars, discussion forums, and award information.
网站简介：SDL International is the world's number 1 provider of free and professional language translation services for websites and documents. Translate from English to Spanish, French, German, Italian, Chinese, Dutch, Portuguese, Russian and Norwegian.
网站简介：Many experts answer questions and provide feedback to homework problems.
网站简介：Learn English online - free exercises, grammar explanations, games and teaching materials.
网站简介：Official site provides news and information about government structure, events, programs and projects, tourism, economy and business. [English, Portuguese, Spanish]
网站简介：World Wildlife Fund - The leading organization in wildlife conservation and endangered species
网站简介：Homework help, tutoring, and formulas.
网站简介：Topic Selection Wizard helps students pick a project topic. Experienced scientists answer student questions in an online forum. Step-by-step project help guide.
网站简介：Includes photos, maps, videos, flags and facts, all indexed by continent and country.
网站简介：A fun science and technology related website with experiments, games, facts and activities for children of all ages.
网站简介：Learn Spanish online. Free tutorial with audio, cultural notes, a random idiom generator, a list of Spanish schools, and links to other helpful sites.
网站简介：Interactive calculators used to for converting between currencies, weight, volume, mass, time, distance and more.
网站简介：Digital media company. Scientists speak directly to listeners in daily science podcasts.
网站简介：A free tool to create, edit, and save your MLA-style bibliography online, then publish it to a Web page, email it, or save it as RTF and open it in Microsoft Word.
网站简介：L'université de Boulder, Colorado, Etats-Unis propose des "simulateurs de phénomènes physiques amusants". [Multilingue.]
网站简介：Non-partisan information on U.S. federal and state candidates, ballot measures, issues and legislation. Includes directory of national and state political resources.
网站简介：Features math games, word problems, worksheets, and puzzles for elementary and middle school students.
网站简介：Primarily a dictionary site but also has the ability to do wildcard searches on the words it knows about.
网站简介：Includes texts from the classical and Renaissance world.
网站简介：Features a different image or photograph of our universe each day, along with a brief explanation written by a professional astronomer.
网站简介：Includes searchable information related to sports, entertainment, geography, history, biography, education, and health.
网站简介：Scholarly Greek text with English translations, including nearly all the surviving Greek dramas..
网站简介：Etexts, focusing on classics and general reference works.