Purdue University Online Writing Lab (OWL)
This is an amazing resource for writers. You've got to see it to believe it.
Research and Documenting Sources
Includes MLA and APA guidelines. Also from the Purdue OWL.
(Son of) Citation Machine
Helps you appropriately format bibliographic and parenthetical citations according to APA and MLA standards so you can "respect the time and creative effort of those whose information you use." Created by David Warlick. Funded by The Landmark Project.
Guidelines for Gender-Fair Use of Language
The guidelines are approved and recommended by the National Council of Teachers of English.
"You CAN beat the clock" if you plan ahead. The calculator helps you plan the writing process based on your deadline, start date, and subject. Offered by the University of Minnesota Libraries.
Info about various topics pertinent to writing from Indiana University.
University of Victoria's Writer's Guide
From the English Department at University of Victoria.