Open Educational Resources
CK-12 - http://www.ck12.org/
Specializing in high quality curated STEM content. Provides the ability to create your own online textbook.
Creative Commons Search - http://search.creativecommons.org
Effective tool for finding copyright free media.
Digital Public Library of America - http://dp.la
Excellent resource to locate primary source materials.
EngageNY - https://www.engageny.org
Provides free Common Core curriculum in English and Math.
Gooru - http://m.gooru.org/gooru/home
Open and collaborative online learning community with customized collections of standards-aligned, interactive, learning materials that have been curated by teachers.
Khan Academy - https://www.khanacademy.org/
Primarily science and math website, but includes thousands of free lessons, games and resources in subjects as diverse as art history and computer programming.
Kennedy Center's ArtsEdge - http://artsedge.kennedy-center.org
The website features lessons and material on using art to teach numerous subjects, including math.
Learnzillion - https://learnzillion.com/
Teachers can access cloud based curricula for FREE, districts can opt for a pay model to get more features.
Library of Congress - https://www.loc.gov/
Excellent resource to locate primary source materials.
MIT's Opencourseware - http://ocw.mit.edu/index.htm
The web-based publication of all of MIT's content is an early example of OER.
National Geographic - http://education.nationalgeographic.org/
National Geographic Learning publishes educational textbooks that must be purchased, but also offers free activities, lesson plans and videos in geography, social studies and science.
National Park Service - https://www.nps.gov/teachers/index.htm
Offers hundreds of student activities, lesson plans and supplemental classroom materials in primarily social studies and science.
OER Commons - https://www.oercommons.org/
A curated digital library of free open educational resources from more than 400 sources. Content is vetted by curriculum specialists.
OpenEd - https://www.opened.com/
Currently includes more than 250,000 videos, games and other resources aligned to standards.
OPEN Online Physical Education Network - http://openphysed.org/curriculummodules
Physical Education Curriculum, Lesson Plans, and Assessments
Openstax College - https://openstaxcollege.org/
Rice University's non-profit develops free textbooks. K-12 schools can access these texts to teach AP Classes.
PBS Learning Media - http://www.pbslearningmedia.org/
Videos, games, lesson plans and curriculum resources sortable by grade, subject, or standard. Also offers free tools for helping teachers build quizzes and lessons.
Project Gutenberg - https://www.gutenberg.org/
Provides access to over 50,000 e-books.
SAS Curriculum Pathways - https://www.sascurriculumpathways.com/portal/
Interactive lessons, documents and resources in math, English language arts, science, social studies and Spanish aligned to multiple standards. Online and mobile apps for students including Writing Reviser.