Dictionaries & thesauri

cambridge-dictionariesCambridge Dictionaries
Dictionaries for English language learners at all levels, including grammar resources and translation dictionaries.
dictionary-comDictionary.com
Thesaurus, Encyclopedia and Language Translator included in both the website and the app. Available on iPhone, iPad and Android.
yr-dictionaryYour Dictionary
A user friendly online dictionary. Aggregating data from a variety of dictionaries and encompassing a thesaurus as well.
thesaurusThesaurus.com

Grammar & writing style guides

grammarlyGrammarly handbook
Online writing and grammar handbook that covers a broad variety of English grammar, punctuation, writing style and writing composition issues.
yr-dictionaryGrammar rules and usage
Basic English grammar rules and usage.
oxford-dictionariesGrammar and usage
Guidance to help improve your grammar and usage, including spelling, punctuation and writing skills.

Encyclopedias

encyclopedia-comEncyclopedia.com
Subject focus: General
Publisher: Cengage Learning
Encyclopedia.com searches trusted encyclopedias, dictionaries, and thesauruses, and provides access to authoritative publications. An ideal reference source.
encyclopedia-of-lifeEncyclopedia of Life
Subject focus: Environmental science, Physical science, Life science, Social science
Encyclopedia of Life brings together knowledge about life on Earth into a single curated, open database from its Content Partners and databases all over the world, this information is then organized in EOL by name of species. EOL pages will be marked with either an UNREVIEWED or TRUSTED label. UNREVIEWED means that it has not yet been evaluated by a specialist or knowledge community. TRUSTED means that the has been reviewed by an EOL curator.
infoplease-encyc-100Infoplease
Subject focus: General
Publisher: Sandbox Networks, Inc.
Information Please has been providing authoritative answers to all kinds of factual questions since 1938, and since 1998 have been providing that service online. Searches an atlas, encyclopedia, dictionary, and thesauri simultaneously on one platform.
new-world-encyclopediaNew World Encyclopedia
Subject focus: General
Publisher: Paragon House Publishers
New World Encyclopedia is an ever expanding body of knowledge that currently contains thousands of carefully selected articles, and combines the use of open source software with the traditional editorial supervision by scholars.
scholarpediaScholarpedia
Subject focus: Applied mathematics, Science, Physics, Play science, Space science
Publisher: Scholarpedia
Scholarpedia is a peer-reviewed open-access encyclopedia that is written and maintained by scholarly experts from around the world.
world-heritage-encyclopediaWorld Heritage Encyclopedia
Subject focus: General
Publisher: World Heritage Encyclopedia
World Heritage Encyclopedia is the aggregation of the largest encyclopedias available, and the most definitive collection ever assembled. WorldHeritage.org is fully accessible on a tablet, smartphone, laptop, and computer.

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