MIT OpenCourseWare: Sloan School of Management
Free courses and materials available.
OER Commons: Accounting
Free courses, modules, and materials.
OpenStax-CNX (aka Connexions) Accounting
Connexions is one of the most popular open education sites in the world. Its more than 17,000 learning objects or modules in its repository and over 1000 collections (textbooks, journal articles, etc.) are used by over 2 million people per month.
Principles of Accounting
Free online textbook written by Larry Walther, Ph.D., CPA, CMA, is the EY Professor of Accounting and Head of the School of Accountancy at Utah State University.