University of Minnesota's College of Education and Human Development has a catalog of open-access textbooks. Some of the titles have detailed reviews, and faculty from other institutions can volunteer to reveiw textbooks for a small stipend.
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Business case studies are a foundation of many business school classes. Here are some places you can search for free case studies to help your classes.
Free Case Studies - Compiled by librarians at the University of British Columbia, these case studies are international in nature.
Free Cases - Another list of case studies compiled by librarians at Queen's University
ITHound.com - 370 case studies available to download, but a free account is needed to view them.
NYT Case Studies - A collection of articles in the New York Times that focus on small business.
IBS Center for Management Research Free Studies - Offers free case studies, mostly focusing on companies in east Asia. These are somewhat hard to use because you can't view them on a single page. Lots of topics available.
Journal of Case Research in Business and Economics - open access journal publishing since 2009 on case studies.
Advertising Educational Foundation Case Histories - Collection of case histories in ad campaigns from well-known brands. Some videos, too.
Book Boon offers free eBooks. The catch is that they have advertisements embedded in them to support their business model. While they may not be textbooks, per se, they do have a wide range of books covering a wide variety of topics.
Also be aware that while these books are free to share, embed, and distribute, they are not free to modify or adapt.
Not only does Book Boon offer textbooks in a variety of business subjects, but they also offer shorter books that can be used for the business professional on the go.
Textbooks
Books for Professionals
MIT's OpenCourseware site has many classes available to download and adapt via Creative Commons Licensing.
Many of the classes are complete with textbooks, syllabi, exam and quiz questions, and exercises, and some even include recorded lectures.
There are too many to list in this one box, but I've linked to specific areas to help you find what you need.
To download all course materials, make sure you visit the "Download Course Materials" link in the left side navigation.
The Sloan School of Management has many business related materials online.
Open.Michigan is an online repository developed by the University of Michigan faculty of open access learning materials. There are lots of materials available, and many of the classes have an low-cost purchase option available of some materials for students who want a print copy of readings.
Most of the content on this site is published under CC BY license, which means you are free to use and adapt with attribution.
College Open Textbooks is a clearing house site that lists open textbooks by subject. Not all of the textbooks listed have been "vetted" by the site editors, so you should review them carefully before using them in your classrooms.
Open Course Library, created with grant funding by Washington State University, provides full courses paired with either free or open source textbooks that are all available via Creative Commons Licensing. Their handy How To Guide provides detailed instructions on how to access and download the class materiels.
For advanced uses, the courses can also be downloaded in Common Cartidge format (compatible with Blackboard) from their Connexions page.
The Saylor Foundation hosts nearly 300 full courses in a variety of topics.
The course outlines and syllubi are all CC-licensed by Saylor, so you are free to use, remix, repost, etc.
However, some of the source materials are protected under different licenses, so please check the copyright status before you use it. Saylor.org's website has more detailed information on the copyright status of their materials.
Merlot offers a variety of learning materials: lesson plans, images, videos, syllubi, quizzes and exams, and even textbooks. Items contributed to the Merlot site are peer reviewed by an editorial board.
While you can search all of Merlot, here are some collections that serve as portals to discipline specific materials.
