A number of online textbooks have been created in the past several years, and this course in linear algebra is a nice addition to the existing repertoire of such educational materials. Professor Rob Beezer of the University of Puget Sound created this introductory textbook, and he still maintains the site and provides updates periodically. The material covered in the textbook includes systems of linear equations, matrix algebra, and Jordan canonical form. Visitors can download copies of the textbook in the pdf format, or they can just read through the text online. The entire text is provided at no cost, and visitors are welcome to make modifications and then distribute their own modified version.