English from BC Campus
This site from Virginia Tech contains openly licensed English textbooks, supplemental material, interactive simulations, and other resources.
Purdue Online Writing Lab
The OWL at Purdue houses free writing materials and instructional resources for students, teachers, and trainers.
Online Resources for Writers
The Writing Center staff at Amherst put together these web resources for describing writing skills and practices.
Rhetoric and Composition
This is a practical guide for students and is designed as a textbook for first year college composition programs.
Teaching Commons links to open educational resources from leading colleges and universities.
The WAC Clearinghouse
In partnership with the International Network of Writing Across the Curriculum Programs, the WAC clearinghouse publishes open-access journals, books, and other resources for teachers who use writing in their courses.
Writing Commons is the open education home for writers. This is a very helpful site for students in a variety of writing courses such as Business Writing, Composition, STEM/technical writing, and creative writing.
Writing spaces is an open textbook project for college level writing studies courses.