There are several platforms teachers can use to do a flipped class. I came across Sophia on twitter and I like the format it has to offer.
There is a creative mode where teachers can make their own tutorials and screencast, edit and publish. It also allows you to make playlists for specific topics/ classes/ etc. I like the tools and tricks it has to offer. I think if flipping a class is a direction one wants to take, this site can do a lot.
I think someone teaching Math or Science can really benefit from the offerings here. It allows you to search for specifics and the classroom setup is very helpful.
If you are planning to flip a class or pull some of the flipped model into your classroom, you might consider looking at Sophia as a place to get started.