Using the many resources of Khan Academy in blended learning is a fantastic resource. This specific example is perfect for my library/tech class offered to 4th graders. A perfect introduction to understanding the devices we use.
Ck-12 offers "FlexBook" textbooks and other OER for teaching Science, Technology, Engineering, and Math (STEM). I will use this resource for teaching in our STEM lab at the Intermediate School, and as an excellent source for PD when teachers are learning about new technology tools at their fingertips.
CrashCourse videos are openly available on YouTube. This links to the Intellectual Property playlist with 7 videos. I plan to use these with the High School English Department and also in sections with professional development to set the stage with appropriate copyright usage for the upcoming school year.