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English grammar quizzes, tests, and exercises
A fun collection of all the tricky points of grammar, including tests and exercises.
Perfect English Grammar
Specialist writing guides
Blogging: Writing Better Blog Posts
Detailed guide to blogging written for blogging.com by a professional blogger.
Words we commonly misspell, spelling guides
A Study of Some of the Most Commonly Misspelled Words
A well-researched and revealing study by Cornell Kimball of the words that are most commonly misspelled. And the winner is…minuscule.
The Free Dictionary Spelling Center
Wikipedia: List of common misspellings in English
yourDictionary.com 100 most often misspelled words
English grammar and style guides
Common Errors in English
A very popular web site based on the book Common Errors in English Usage by Professor Paul Brians.
The Elements of Style by William Strunk, Jr.
An online reproduction of the original (1918) book that was later revised (in 1957) by E B White. The revised version, now in its fourth edition, is easily and rightfully the most popular book on English style ever published.
Plain English guides
Plain English Guide
British Plain English Campaign web site featuring a range of useful plain English guides.
US Government web site featuring a comprehensive Plain English handbook that can be viewed online or downloaded as a pdf file.
English dictionaries and thesauri
Dictionary.com and Thesaurus.com
dictionary.com and thesaurus.com
These companion sites are the most popular online dictionary and thesaurus, and include definitions, spellings, audio pronunciations, example sentences, and word origins. Dictionary.com’s main source is the Random House Unabridged Dictionary, supplemented numerous sources including American Heritage and Harper Collins.
Dictionary and thesaurus.
The Free Dictionary
Illustrated dictionary and thesaurus with convenient links to Wikipedia entries. Lots of great content including word and grammar quizzes.
Glossaries of grammatical terms
Glossary and free grammar lessions
British English versus American English
Wikipedia: American and British English differences