The document discusses open educational resources (OER) which are educational materials and resources that are freely available and can be reused, improved and redistributed. It lists several examples of OER including WikiBooks, the National Library of Virtual Manipulatives, iTunes U, Lit2Go and YouTube EDU. It also discusses open-source learning management systems like Moodle and Sakai as well as the Xerte project for creating reusable learning objects. The document advocates for using these open resources to provide personalized learning opportunities for students.