Cloudschool is a platform that allows teachers to create and publish multimedia lessons. It is also free!
This article from the blog FreeTech4Teachers explains how both teachers and students can benefit from using Cloudschool. Instructors can choose how they want their lessons to appear, by using text, pictures, audio, and videos. They can download and print copies of their lessons, or share them online with other instructors. Students are able to access their lessons from anywhere, and can see their grades and feedback easily.
The platform also has a way for instructors to ask discussion questions, and have students answer them within Cloudschool. There are lots of special features, like visibility control and keeping up with current grade level curriculum.
Watch this short video for an introduction to Cloudschool: