One of the greatest strengths in OER is the possibility of editing e-resources to better suit your needs. A vast majority of open e-textbooks have creative commons licenses that allow you to alter, add, subject, re-create, and manage content. However, you must follow the terms of the creative commons license the original was filed.
Most of the open textbooks are available as PDFs. Consequently, if you have access to Adobe Acrobat Complete you can edit the textbook.
A few e-textbooks require special software to edit, such as Pressbooks.
The Rebus Community is a non-profit organization committed towards developing open textbooks and related content. Their focus appears to be helping authors create content and share it. Their web presence is a simple forum menu with many links, videos, and how-to manuals.
Frazar Library is experimenting with editing textbooks. We hope to have more experience and demonstrations in the future.
McNeese State University Library
300 Beauregard Drive
Lake Charles, LA 70605