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.
The English Language - A site with thoughts on why using sound English is important and on just what "sound English" is.
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.
Fundamental Grammar - NIU English - A comprehensive page covering major word classes, punctuation guides, phrases, clauses and sentence structures accompanied by quizzes.
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.
"Get It Write" English Grammar and Usage Tips - The site offers a new tip about English grammar and usage every two weeks. Currently the archive contains thirty-four tips. People can subscribe to have the tips sent to their e-mail address free of charge.
Tutoring English Grammar and Composition - Free online program of instruction in basic English grammar and composition for the use of parents and others and for those learning English as a second language.
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.
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.