Reference Tools
- Dictionary: Meanings and Definitions of Words
- Cambridge Dictionary: Find Definitions, Meanings & Translations
- Macmillan Dictionary: Free English Dictionary and Thesaurus
- Collins Online Dictionary: Definitions, Thesaurus and Translations
- Oxford Learner's Dictionaries: Find definitions, translations, and grammar explanations at Oxford Learner's Dictionaries
- The Free Dictionary: Dictionary, Encyclopedia and Thesaurus
- Merriam-Webster: America's most-trusted online dictionary
- Merriam-Webster's Learner's Dictionary
- Lexico: Definitions, Meanings, Synonyms, and Grammar by Oxford Dictionary
- Abbreviations: The Web's largest and most authoritative acronyms and abbreviations resource
- Abbreviations and acronyms dictionary
- Computer Language
- Definitions: Free online dictionary with definitions from many resources and in more than 20 different languages, including audio pronunciations, translations, etymologies, usage examples and more...
- Legal Dictionary
- Wolfram MathWorldThe Web's Most Extensive Mathematics Resource
- Thesaurus: The world's favorite online thesaurus!
- Vocabulary Dictionary: Meanings, Definitions, Quizzes, and Word Games
- Online Etymology Dictionary: Origin, history and meaning of English words
- OpenMD: Medical Dictionary
- Urban Dictionary
- Thinkmap Visual ThesaurusAn online thesaurus and dictionary of over 145,000 words that you explore using an interactive map
- YourDictionary: Dictionary definitions you can understand
- Wordsmyth: Free On-Line English Dictionary | Thesaurus | Children's, Intermediate Dictionary
- The Acronym Server: find and submit acronyms and meanings
- NetLingo: Every Texting Acronym & Online Abbreviation You'll Ever Need to Know
- Infoplease: An Online Encyclopedia, Almanac, Atlas, Biographies, Dictionary, and Thesaurus
- Guinness World Records
- The Old Farmer's Almanac: long range weather forecasts, full moon dates, weather history, sun rise set times, gardening, recipes, folklore
- The Yearbook of the United Nations
- Atlapedia®: Online contains full color physical maps, political maps as well as key facts and statistics on countries of the world
- Columbia Gazetteer: the renowned geographic encyclopedia
- Maplandia: provides the searchable world gazetteer based on Google Maps, the most comprehensive online satellite imagery ever available
- MapQuest: Maps, Driving Directions, Live Traffic
- NatGeo Maps: Learn about National Geographic's century-long cartographic tradition and the policies and methods we use to make the world's most authoritative and beautiful maps
- World Atlas: Atlas of the World Including Geography Facts and Flags
- S9: a Wikipedia type system and everyone can edit biographies or even create their own
- Biography: Famous People
- Biography Online: Biographies about famous, inspirational and influential people, who have helped to shape and change the world
- Who2 Biographies: Historic figures, celebrities, and more
- Art cyclopedia: The Fine Art Search Engine
- Catholic EncyclopediaOne of the biggest Catholic resources on the Internet, containing more than 10,000 articles
- Encyclopedia: Online dictionary and encyclopedia with pictures, facts, and videos
- Holocaust Encyclopedia: The Holocaust was the state-sponsored systematic persecution and annihilation of European Jews by Nazi Germany between 1933 and 1945. Start learning today
- The On-Line Encyclopedia of Integer Sequences® (OEIS®)
- Stanford Encyclopedia of Philosophy
- Encyclopedia Britannica: Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts
- Oxford Research Encyclopedias
- Columbia Encyclopedia
- Encyclopedia of Life
- Encyclopedia Mythica: is the premier encyclopedia on mythology, folklore, and religion. Instant mythology since 1995
- Internet Encyclopedia of Philosophy
- Symbols: the world's largest online encyclopedia of symbols, signs, ideograms, glyphs and flags - organized by culture, country, religion, and more
- Reference
- Stanford Encyclopedia of Philosophy
- World Digital Library: provides free access to manuscripts, rare books, maps, photographs, and other important cultural documents from all countries and cultures, in Arabic, Chinese, English, French, Portuguese, Russian and Spanish
- Encyclopedias - World Book International
- World Statistics: international statistics, country population, economic and social data provided by International Organisations
- Global Health Observatory: is WHO's gateway to health-related statistics for its 194 Member States. It provides access to over 1000 health topics indicators
- UNSD: Demographic and Social Statistics
- Economic and Social Database
- OECD Statistics
