ACE Copyediting
A free monthly self-help writing guide for students of the English language who want to communicate more effectively. Guide covers grammar, punctuation, spelling, cliches, and jargon.
http://www.acecopyediting.com/ACEcopyediting%20-%20Self-Help%20Guide.htm

Webgrammar's Place
Tips, tutorials, and resources for writers, students, editors, educators, and web designers. Also, Webgrammar answers questions about American English grammar, punctuation, spelling, capitalization, and usage.
http://www.webgrammar.com

The Kings's English, 2nd ed.
Online publication of H.W. Fowler's "The King's English."
http://www.bartleby.com/116/

Reflexive Pronouns
Explanation of usage for reflexive pronouns: myself, himself, herself, themselves, and ourselves. Includes practice sentences and an answer key.
http://www.lessontutor.com/eesReflexive.html

Sentence Diagrams
Diagrams of moderately long and complex sentences are accompanied by explanations for both beginners and experienced diagrammers.
http://www.geocities.com/gene_moutoux/diagrams.htm

Plain English Training
Online courses in plain English and grammar.
http://www.plainenglishtraining.com

Basic Cozy Grammar Course
A light hearted approach to learning basic English grammar. Featuring 27 lessons contained on two videos with companion workbook/study guide.
http://www.splashesfromtheriver.com

Daily Grammar
Improve your writing with free daily e-mail grammar lessons.
http://www.dailygrammar.com/

English Grammar Tutor
An online grammar book for student editors.
http://www.englishgrammartutor.com

Your Guide to English Prepositions
Software program designed to help users find/know the right preposition in 5 seconds.
http://www.goodenglish.com

Get It Write - Tip Archive
Offers a new tip about English grammar and usage every two weeks. Subscription service available to have tips sent via email.
http://www.getitwriteonline.com/archive/tips.htm

Focus on Usage and Grammar
This page, provided by The Writer's Place, discusses various problems and rules concerning English grammar, usage, and elements of style.
http://www.thewritersplace.com/writestuff/grammar.htm

English 126 HyperTextBook
Modern English Grammar from the Daniel Kies and the College of DuPage.
http://papyr.com/hypertextbooks/engl_126/book126.htm

Gallaudet Writer's Handbook
This site is an online version of the grammar and style handbook that was designed specifically to improve the writing skills of deaf and hard of hearing college students.
http://academic.gallaudet.edu/handbooks/writers.nsf

Grammar and Usage for the Non-Expert
Targeted, nontechnical articles on problems of grammar and usage that even good writers sometimes have trouble with.
http://www.grammartips.homestead.com/index.html

Chicago Manual of Style FAQ
FAQ site designed to help CMS users eliminate ambiguities or misunderstandings found in the book itself.
http://www.chicagomanualofstyle.org/cmosfaq.html

Glossary of English Grammar Terms
A fully cross-referenced dictionary of gramatical terms of English language containing more than 250 English grammar entries.
http://www.usingenglish.com/glossary.html

Grammarphobia.com
Brought to you by Patricia T. O'Conner, author of "Woe Is I," and the writer Stewart Kellerman.
http://www.grammarphobia.com

The Online Writing Project
Provides and organizes writing guides and grammar handouts created by writing centers and English Departments at American universities.
http://cai.ucdavis.edu/trc/trcdefault.html

Plain Words
A guide to the use of English by Sir Ernest Gowers.
http://www.ourcivilisation.com/smartboard/shop/gowerse/complete/index.htm

The English Language
A site with thoughts on why using sound English is important and on just what "sound English" is.
http://owlcroft.com/english/

Clear English Grammar Resources
A wide collection of online grammar resources covering grammat topics from articles to verbs.
http://www.clearenglish.net/grammar.htm

Online Writing Resources
Interactive lessons in grammar, mechanics and punctuation using PowerPoint, Word, and HTML.
http://xnet.rrc.mb.ca/leshanson/Writing_Resources.htm

A Concise Guide to Writing, Language, and Grammar
Rules of capitalization and punctuation, as well as commonly mispronounced and misspelled words.
http://www.infoplease.com/ipa/A0001600.html

Washingtonpost.com: A Dash of Comma Sense
Columnist gives examples why correct punctuation is important.
http://www.washingtonpost.com/wp-dyn/articles/A43938-2004May20.html

Grammar Bytes
Grammar explanations, handouts for teachers and students, and interactive exercises.
http://chompchomp.com

Grammar Check
Offers opt-in subscribers a free, monthly ezine with a grammar feature and questions and answers submitted by readers, along with a review of a writing resource.
http://www.grammarcheck.com

Commonly Misused Words
Explains the difference between similar words with different meanings.
http://www.sourceaid.com/reference/pdf/misused-words.pdf

Writing Assistance
The site improves literary style in written English, corrects grammar, spelling and syntax; and gives clarity to presentation of material. It applies to essays, research papers, projects, theses and reports.
http://writingassistance.mysite.wanadoo-members.co.uk/

Serendipity: Common Errors
An examination of common errors that are becoming generally accepted as correct. A mini-course in English usage.
http://www.serendipity.li/errors.html

What's the Plural of `Virus'?
A thorough investigation.
http://www.linuxmafia.com/~rick/faq/plural-of-virus.html

Grammar and Punctuation in American English
A site that contains information on grammar and punctuation, including parts of speech and parts of sentences.
http://www.geocities.com/k9would/

The Scarlet Pen
Downloadable style and usage guide containing 300 commonly misused words and amusing sample sentences. [Microsoft Word format, 240kb in size]
http://home.earthlink.net/~thescarletpen/scarletpen/guide.html

Apostrophe Protection Society
Illustrates the correct use of the apostrophe in spelling the plural and possessive. Gives examples of misuse and the rules and examples for correct use.
http://www.apostrophe.fsnet.co.uk/

The Grammar Guru
Web site of syndicated columnist and author of The Grammatically Correct Handbook. Read columns, book chapters, find out how to order the book.
http://www.thegrammarguru.com

Grammar Hotline Directory
Find phone numbers, e-mail addresses, web sites which you can contact for answers to short questions about writing.
http://www.tcc.edu/students/resources/writcent/gh/hotlinol.htm

Grammar Now
Grammar and composition questions answered. Proofreading and editing service are also offered.
http://www.grammarnow.com

Grammar Sucks
Free, personalized answers to questions on grammar, language, usage, syntax. It also contains humorous looks at English grammar. Allows for paid work on documents.
http://www.grammarsucks.com

All You Need to Know About Commas
This site will give you information, definition, and rules about commas. Also has links to other sites for further information.
http://freewebs.com/ashk4007/

English Chick: Grammar Lessons
Starts with remedial lessons and expands to other sites.
http://www.englishchick.com/grammar/

The Grammar Doctor
This site offers tips and advice on grammar and usage.
http://www.grammardoctor.com/

The Grammar Curmudgeon
Discusses grammatical rules, offers pointers for writers, presents essays on language and related topics, and contains three open discussion boards.
http://www.grammarmudge.cityslide.com

English Grammar The Easy Way
This site explains English, so that everyone can understand.
http://www.english-the-easy-way.com