Repositories

General
OER Recommender

OER Commons

Wikibooks

OpenCourse.org

Textbook Revolution

National Science Digital Library (NSDL)

K-12
Curriki

Free High School Science Texts

Schools Without Limits

California Open Source Textbook project

CK12

K12 Online (Wikia) K12EdCom

Wikieducator K-12 math page

MoodleCommons.org

Yahoo Teachers

Next Vista for Learning

Early literacy - FreeReading

Open Educator Inc.

Wikispaces

Higher Ed
Connexions

MIT OpenCourseWare

EduCommons