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 Consortium: 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.