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Vocabulary.com helps you learn new words, play games that improve your vocabulary, and explore language.

Information about English words derived from Latin and Greek sources and English vocabulary words with etymologies plus explanations. and quizzes

English (US, UK, Can, Global), Spanish, Portuguese, and Google Books. Search by PoS, collocates, synonyms, genre, dialect, historical, etc. Downloadable data also.

English obscure words and etymology resources: online dictionary of weird and unusual words, word lists, technical vocabulary aids, lipograms, and word related essays

A controlled vocabulary can be useful in describing images and information when organizing and classifying content for electronic databases. Find sample hierarchies and controlled vocabularies online.

The Open Metadata Registry Project Resource Description and Access (RDA) Vocabularies

Quizlet is a lightning fast way to memorize vocabulary lists. It

Welcome to the UIL: The University Interscholastic League was created by The University of Texas at Austin to provide leadership and guidance to public school debate and athletic teachers. Since 1909 the UIL has grown into the largest organization of...

Hundreds of fun educational games and activities for kids to play online. Topics include math, geography, animals, and more.

Learn English with the About.com guide to English as a 2nd language (ESL / EFL). Learn English using resources including English grammar explanations, quizzes, pronunciation help, reading, listening and writing and esl free lesson plans. Exam resourc...

The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to develop Web standards.

BusinessEnglishSite.com - Business English Vocabulary and Grammar Exercises for ESL Students