The State of New York used federal funds to develop K-12 curriculum resources aligned to the common core. These open educational resources are also free for other states to use.
At the Common Core Library page, you can use the check boxes in the left column to "drill down" to resources at specific grade levels for specific subjects.
Based on the EngageNY curriculum, UnboundEd provides free, standards-aligned PreK-Grade 12 resources in English Language Arts and Mathematics. These are enhanced by free professional learning resources, including teaching guides, videos and podcasts.
A "problem-based core program" currently offered for grades 6-8. Resources are free and include support for ELLs and students with disabilities. This nonprofit project was lead by one of the writers of the mathematics common core standards. You need to create a free account to view the curriculum:
1. Under View teacher materials for: choose the Grade Level.
2. If you already work as a teacher for a school, you can choose School--otherwise choose Other (and on the next page explain that you are a pre-service teacher). Pre-service teachers won't be able to get the assessments, but can access the rest of the curriculum for free.
This curriculum received a near perfect score in a curriculum evaluation by the nonprofit EdReports.
"HippoCampus.org is a free, core academic web site that delivers rich multimedia content--videos, animations, and simulations--on general education subjects to middle-school and high-school teachers and college professors, and their students, free of charge."
This community site where educators can share free open educational resources has accumulated a large collection of resources on most K-12 subjects. Tip: Click More Options to be able to search by grade level.
A project to bring free open textbooks to Michigan K-12 students. At this site you can learn about the project, about using open texts, and you can download the currently available free social studies texts, which include:
My Self and Others (KIndergarten)
Families and Schools (1st grade)
Community Studies (2nd grade)
Michigan Studies (3rd grade)
United States Studies (4th grade)
United States History (5th grade)
World Geography (6th grade)
Ancient World History (7th grade)
United States History (8th grade)
United States History (high school)
World History (high school)
Civic Life (high school)
Economics and You (high school)
Open access textbooks that are free to download and available for purchase in inexpensive print form. These include free teaching tools such as labs, videos, and datasets. Texts include: Statistics, Statistics with Randomization and Simulation, Advanced High School Statistics.
Still in Beta form, this site will allow teachers to upload and share curriculum materials, Although the uploading feature isn't up yet, there is content on the site which can be searched by grade level, subject, material types, and links to standards.
"Classroom-ready daily ELA lessons developed in partnership with the Louisiana Department of Education. Units include daily lessons, assessments, texts, blank and completed handouts, and student writing examples."
K-12 resources for English Language Arts, Math, Science, Social Studies, and Spanish. Resources are aligned with standards and can also be browsed by standard. You have to sign-up and create a login to use the site, but there is no cost to you. This collection of free resources is supported by the software company SAS.
This video of a 2017 keynote presentation at Lansing Community Colleges is excellent. Dr. Cable Green is the Director of Open Education at Creative Commons. Don't let the initial focus on community colleges deter you, later in the talk he discusses how open education materials are being used in K-12.
"Through the #GoOpen campaign, the U.S. Department of Education supports states, school districts and educators using openly licensed educational materials to transform teaching and learning." Michigan is one of the 20 a Go Open states.