Sophia.org is what you're looking at right now: a Levels 2 & 3 one-stop free resource to house everything for your flipped classroom. With the ability to share videos, PDFs, quizzes, links, and so much more, Sophia has the potential to revolutionize the way you teach. Teachers need an account to create tutorials. Students can sign up using a phone number if they don't have an email address, but an account isn't required to see the tutorials you create.
Be sure to scroll down to access all available training resources.
Download this printable QuickStart guide for yourself and your students.