Creative Commons

http://www.creativecommons.org

Creative Commons is an alternative to traditional copyright, developed by a nonprofit organization of the same name. Have a look at this site if you don't know what creative commons is.

Curriki- Global Education and Learning Community

http://www.curriki.org

Curriki is an online environment created to support the development and free distribution of world-class educational materials to anyone who needs them. It is supported By Sun Microsystems so is a driving force, though the lesson plans are not in the best format.

Carnegie Mellon Open Learning Initiative

http://www.cmu.edu/oli

Carnegie Mellon's Open Learning Initiative is a collection of "cognitively informed," openly available and free online courses and course materials in an online format. The courses are evaluated and improved continuously.

Curriculum Hot Spots on the Web

http://districtadministration.ccsct.com//page.cfm?p=495

DISTRICT ADMINISTRATION presents the annual Curriculum Hot Spots on the Web. It includes the latest search tools, lesson plan collections, research sites, sources for online projects, media resources, and curriculum centers in every content area.

Connexions

http://cnx.org

Connexions is a collection of free materials and software tools to help authors publish and collaborate and to help instructors build and share custom courses. Their Content Commons contains small "knowledge chunks" called modules and courses.

Digital Library for Earth Science Education (DLESE)

http://www.dlese.org/library

Digital Library for Earth Science Education is a distributed community effort involving educators, students, and scientists working together to improve the quality, quantity, and efficiency of teaching and learning about the Earth system at all levels.

Global Education and Learning Community

https://edu-gelc.dev.java.net/nonav/index.html

The GELC community's mission is to improve global education by empowering teachers, students and parents with self-paced, web based, free and open content (curriculum resources, assessment) and best practices for advancing student achievement.

K-12 Educational Commons for OpenCourseWare

http://k12edcom.org

The mission of K12EdCom.org is to promote and publish OpenCourseWare for K12 schools. OpenCourseWare is curriculum and learning material published under the Creative Commons License. The site provide links, textbooks, courses, blogs, and forums.

Greenstone Digital Library Software

http://www.greenstone.org

Greenstone is a suite of software for building and distributing digital library collections. It provides a new way of organizing information and publishing it on the Internet or on CD-ROM.

MAA Mathematical Sciences Digital Library

http://mathdl.maa.org

MathDL is an online resource published by the Mathematical Association of America. The site provides online resources for both teachers and students of mathematics.

MERLOT- Multimedia Educational Resource for Learning and Online Teaching

http://www.merlot.org

MERLOT is a leading edge, user-centered, searchable collection of peer reviewed, higher education, online learning materials created by registered members, and a set of faculty development support services.

MIT OpenCourseware

http://ocw.mit.edu

OpenCourseware is a free and open educational resource for faculty, students, and self-learners. OCW supports MIT's mission to advance knowledge and education, and serve the world in the 21st century.

National Science Digital Library NSDL

http://nsdl.org

The National Science Digital Library (NSDL) was created by the National Science Foundation to provide organized access to resources and tools that support innovations in teaching and learning at all levels of science, technology, and engineering.

Open Educational Resources Commons

http://www.oercommons.org

Open Educational Resources (OERs) are digitized materials offered freely and openly for educators, students and self-learners to use and re-use for teaching, learning and research.

New York Public Library Digital Gallery

http://digitalgallery.nypl.org

NYPL Digital Gallery provides access to over 415,000 images digitized from primary sources and printed rarities in the collections of The New York Public Library, including illuminated manuscripts, historical maps, vintage posters, prints and more.

Open Content Alliance

http://www.opencontentalliance.org

The Open Content Alliance (OCA) represents the collaborative efforts of a group of cultural, technology, nonprofit, and governmental organizations from around the world that will help build a permanent archive of educational content.

The Open Video Project

http://www.open-video.org

An open content digital video collection.

OpenLearn - The Open University

http://openlearn.open.ac.uk

The OpenLearn website will make educational resources from the Open University freely available on the internet, with state of the art learning support and collaboration tools to connect learners and educators.

OpenCourse

http://opencourse.org

OpenCourse is a collaboration of teachers, researchers, and students to develop open, reusable learning assets (e.g., animations, simulations, models, case studies, etc.). Subject focused collaboratories provide links to many reusable learning objects.

Opsounds

http://opsound.org

Opsound is an experiment in applying the model of free software to music. Musicians and sound artists are invited to add their work to the Opsound pool using a copyleft license developed by Creative Commons.

Teacher Domain

http://www.teachersdomain.org/

Lots of K12 content for teachers in byte sized bits, categorised in all common subject categories.