Openly Available Sources Integrated Search (OASIS) is a search tool that is being developed at SUNY Geneseo's Milne Library. It searches open educational resources on many sites.
Open Course Library:
Saylor.org: Saylor offers full courses online. It can be really helpful to use the reading lists from Saylor to find and organize your courses.
Open Courseware: An independent search engine that indexes open education classes from places like MIT, Yale and UMass.
LearningSpace from Open University: All of the learning materials presented on this site are CC licensed, but don't confuse "Learning Spaces" with the full Open University- their licensing/copyrights are different.
OCW Utah: Open education course materials aimed at a high school level.
Bridge to Success: Materials, mostly study skills, to support students transitioning to college.
Academic Earth: Find lectures and videos from some of the most respected instructors in the world.
Stem Cell School: Lessons and quality digital imaging about stem cells and stem cell science.
Ted: Inspiring thinkers on a range of subjects present big ideas and lectures on a regular basis- completely CC licensed.
Khan Academy hundreds of short educational videos covering many subjects; especially strong collections in science and math.
PhET Science Simulations: These interactive tools from the University of Colorado at Boulder are mostly CC licensed.
Wikimedia Commons: The thinkers behind Wikipedia bring you images, video and music all openly licensed or in the public domain.
CLIP Information Literacy Tutorials: Find great tutorials on information and research competencies.
HippoCampus: HippoCampus, a project of the Monterey Institute of Technology and Education (MITE), is full of high-quality resources in a variety of subjects. It is aimed at high school and college level users.
Jamendo: Songs by musicians who want to share their music.
Critical Commons: A community of people who seek to promote the use of media in teaching. The materials posted here are mostly presented using Fair Use guidelines.
Public Library of Science: An open publisher whose mission is to change the nature of sharing scientific research through open access.
Directory of Open Access Journals: The most comprehensive collection of open access journals in a variety of disciplines. Unfortunately, you can search by journal subject, but not by article subject.
Open Stax: Rice Connexions is providing peer reviewed, quality open textbooks. There are some amazing textbooks available here, but some are still in production.
College Open Textbooks: This effort funded by the Hewlett Foundation, seeks to drive adoption of open textbooks. Many of the books shared on this resources are reviewed.
Open Textbook Library: Hundreds of complete, open college-level textbooks.
BC OpenEd a curated collection of open textbooks, many reviewed by British Columbia faculty.
Boundless: Boundless works with experts to compile web-based openly available content into the same general arrangement of textbooks. You can actually search the ISBN for your current textbook and see what content Boundless would use to replace it.
Open Academics: University of Minnesota collection of open textbooks with full reviews.
Global Textbook Project: High-level texts hosted or created by the University of Georgia.
Wikibooks: A project of the Wikimedia Foundation, this collection of group written textbooks in a variety of sources follows rules similar to Wikipedia.
Project Gutenberg: Find the full text of classics and public domain works from the first massive ebook creating organization in existence. Nothing fancy here, just files with the full text.
Google Books: Some books presented in this mass conglomeration of scanned books are fully available, most are excerpted.
Bloomsbury Academic: Bloomsbury is a well-respected and long time UK publisher who has released some of their academic titles for open access/open education.
Merlot: This repository is one of the biggest and more famous places to find and share teaching resources.
Connexions: Large repository of individual teachers' content, some courses and lots of modular writings about a variety of topics.
OER Commons: This resource seeks to collect and distribute a variety of OER at a variety of levels and subjects.
The Orange Grove: Florida's collection of open ed sources.
Curriki: Open source materials for K-12.
Open Scout:UK based database of business skills teaching resources. Includes articles, tutorials, video and much more in a variety of languages.
AMSER: Materials in the Applied Math and Science Educational Repository are free for use and adaptation. Most resources are at the high school and community college levels.
Free: The mission of Free is to make the learning resources of the US Government easier to find. There are over 1500 lessons, objects, and tools for teaching from the federal government located here.
Edsitement!: Learning objects and lessons from the National Endowment for the Humanities. It offers a large collection of peer evaluated websites.
Open Culture: This blog formatted repository seeks to bring together free resources on culture and education. The list of movies here is impressive.