CK-12 Foundation gives access to high quality educational materials for K-12 students all over the world.
They have high-quality, standards-aligned, open content in the STEM subjects.

This is an OUTSTANDING resource. Be sure to check out the Math & Science FlexLets

Students - select "switch to student version" from the top menu.

Find materials free course materials for educators. The materials are all free, open and can be customized to suit your needs.

Education
Academic/Career Success
Art & Design
Biological/Physical Sciences
Business
Communication & Writing
Computer Science
Earth/Ocean Science
Engineering
Health and Medical
Hospitality Tourism
Humanities
Language Learning
Law and Criminal Justice
Math and Statistics
Social Sciences
Trades
Digital Literacy

"The Core Knowledge Foundation provides open access to content-rich curriculum materials for preschool through grade 8, including the Core Knowledge Curriculum Series™, with many materials now available and many more in development."

You will need to provide your email address to download these amazing resources. CK has aligned their ELA to the Science of Reading in collaboration with Amplify Reading.
*Full Units
*Books for Students
*Teaching Materials
*Scope & Sequence

"Pearson School eText is an easy-to-use database of content available to you anytime and anywhere that you have internet access. Students and teachers log in using unique information to access all of their content."

There are books available for Math, ELA, Science & Social Studies.

Free online education courses. The site features a lot of material found only on universities’ private sites, all in easy to browse categories.

1300 Free online courses
Over 1000 free movies
700 audio books
800 ebooks
200 textbooks
300 language lessons
150 business courses
Free K-12 Education.

FREE! You will need to visit other sites to find these, but they are all organized nicely for you in one spot.