Writing and Grammar
Common Errors in English http://www.wsu.edu/~brians/errors/
Click on "Go to list of errors" to see an extensive collection of words that are often misused or are confusing.
The Elements of Style http://www.bartleby.com/141/
A classic book of simple advice on writing by William Strunk. Even though this is the 1918 edition, it's still good.
The Fallacy Zoo http://www.goodart.org/fallazoo.htm
Useful for writing or analyzing arguments. Brian Yoder's list includes definitions, examples and analysis of common fallacies.
Guide to Grammar and Style http://andromeda.rutgers.edu/~jlynch/Writing/contents.html
Information on very specific aspects of grammar. From Rutgers University professor Jack Lynch.
MLA Documentation Guide http://library.austincc.edu/help/MLA/
How to handle quotes, paraphrases, and creating the Works Cited list. MLA is the most commonly used format for papers in literature and the humanities.
Nuts and Bolts of College Writing http://nutsandboltsguide.com/nb-home.html
Although designed to accompany a specific textbook, this site has lots of info anyone can use on all aspects of writing, including MLA documentation.
Paradigm Online Writing Assistant http://www.powa.org/
Nicely designed guide to writing various types of essays and documenting them.
Purdue On-line Writing Lab http://owl.english.purdue.edu/
The most extensive, oldest, and best-known virtual writing center on the Web. This site offers resources for writers, links to other on-line writing centers.
Quoting & Paraphrasing http://www.wisc.edu/writetest/Handbook/QuotingSources.html
When and how to use information from research sources. From the University of Wisconsin-Madison Writing Center.
Webgrammar http://www.webgrammar.com/
Basics on spelling, punctuation, grammar, usage, etc. There's also a Writing Resources area with links to many other web resources.
Writer's Workshop http://www.english.uiuc.edu/cws/wworkshop/index.htm
Many areas of writing help, such as a grammar handbook, how to get friendly critiques of your writing, tips and techniques, and more. From the University of Illinois.
Writing Argumentative Essays http://www.eslplanet.com/teachertools/argueweb/frntpage.htm
Step-by-step process for writing papers where you take a stand on an issue.
The Writing Process http://library.austincc.edu/help/writeproc/
Austin Community College Library study guide.