Open Course Library
"The Open Course Library is a collection of expertly developed educational materials – including textbooks, syllabi, course activities, readings, and assessments – in 81 high-enrollment college courses. 42 courses have been completed so far, providing faculty with a high-quality, affordable option that will cost students no more than $30 for textbooks. All materials are shared under a Creative Commons (CC BY) license unless otherwise noted." Also available via Connexions.