11 Rules of Grammar - concise writer's guide to the most frequently violated rules of grammar, with dynamic links to more detailed online references.
Able Writer: A Rhetoric and Handbook - describes an English composition handbook that treats pre-writing, outlining, English grammar, usage, word choice, dictionaries, spelling, punctuation, and writing college research papers.
Antagonyms - words that have opposite meanings (e.g., "bad" can mean bad or good depending on usage).
Basic Guide to Essay Writing - a step-by-step guide to writing a basic essay. Includes links to other on-line essay resources.
Capitalization [larc.nasa.gov]
Common Errors - discussion of errors in English usage which are so common that some people don't recognise them as errors.
Common Errors in English - site which simply and entertainingly explains a number of common spelling and usage errors in English.
Darling's Guide to Grammar - prepared by Professor of English/Humanities Charles Darling for his English courses at Capital Community-Technical College.
Distinctionary - synthesis of a thesaurus, dictionary and personal development course.
Elements of Style - by William Strunk, Jr.
English Grammar Clinic - your grammar questions answered by professional English language instructors.
Five Tools for Writing Timed Essays - develop skills in the use of a set of specific intellectual tools, described here.
Focusing on Words - This advanced English-language site is here as a guide by your side so you can experience the wonder of words and the English language.
Glossary of Literary Terms and A Handbook of Rhetorical Devices
Good English - how to write English well.
Grammar and Style Guide - guide to grammar and style, prepared by Jack Lynch of the University of Pennsylvania.
Grammar Bytes - explanations, handouts for students and teachers, and interactive exercises.
Grammar Girl's Guide to the English Language - Grammar Girl guides you, super-hero-style, through the basics of English grammar, style, and usage.
Grammar Lady - stamping out bad grammar and offering answers to all of your English grammar questions.
Grammar Slammer Online - online English grammar help. Includes letter writing, confusing words, and easy search engine.
Guide to Grammar and Writing
Handbook of Rhetorical Devices - definitions and examples of more than sixty traditional rhetorical devices, which can be useful in improving the effectiveness, clarity, and enjoyment of your writing. By Robert Harris of Southern California College.
Heteronyms - words that are spelled identically but have different meanings when pronounced differently (e.g., wind or lead).
Loquacious Language - a regularly appearing language column published by Michael Tseng in his school newspaper, inspired by William Safire.
Michael Bonner's Proper Grammar Page
MLA Style
odd prose - selection of odd sentences from student essays. This page exists to encourage students to improve their proficiency in written English. Includes common errors found in student papers.
On-Line English Grammar
Owl Handouts - ranging from precisely targeted help (Comma vs. the Semicolon in Compound Sentences) to general guidance.
Paradigm Online Writing Assistant - guide to writing, composition, rhetoric, editing, and style.
Pop-Up Grammar - online English grammar instruction site with interactive quizzes.
Punctuation [larc.nasa.gov]
Save the Adverb - dedicated to preserving the adverb from extinction.
Self-Study Quizzes for ESL Students
Slot, The - part style manual, part pet-peeve collection, The Slot is one copy editor's look at how to use, and how not to use, the English language.
Trinity College Allan K. Smith Writing Center
Wired Style - principles of English usage in the Digital Age.
Wordpower - increase yours. Write a report, pen a news release, cite and list references.
Words to the Wise - monthly newsletter for marketing professionals.
World Wide Words - Michael Quinion's language pages include articles, the word hoard, newsworthy words, and usage notes.
Writing for Multimedia: A Guide - style guide.
FAQ - Style - style and usage questions and answers from the copyediting-l mailing list.