These CS education repositories are a helpful way of sharing and accessing valuable resources.
Computer Science Education Research: A centralized source for research on teaching computing to K-12 students and teachers
CSforAllTeachers.org: A virtual community for CS teachers, who can join groups by curriculum, grade level, etc., including ways to search for resources. They also host great webinars.
CSforAll: Search under “Consortium” and you can filter members to find Content Providers, filtered by grade level, etc.
CSTA: Has a web repository (“Resources” > “Highlighted Resources”) as well as info about professional learning, etc.
Code.org: in addition to its own courses and platform, it has links to 3rd party curricula, search under “Teach” and they are by grade level.
LeadCS: A website for K-12 education leaders in schools and districts and their partners looking to begin or improve a computer science education initiative. It houses a collection of research-based tools and recommendations.
EngageCSEdu: A collection of peer-reviewed course materials for introductory computer science courses (CS0, CS1 and CS2), including high school materials that align to CSTA's standards. Materials are submitted by the CS community and are peer reviewed.