TED-Ed offers a pool of existing short lessons on a variety of topics. Also you can easily create your own lecture through customising any existing TED-Ed original lesson, TED Talk, or Youtube video. Apart from adding quizzes and external links, you can also track the progress of students watching your video. You can also use TED Talks that consist of great, enriching speeches from people coming from different walks of life.

https://youtu.be/JQDgE_eJGTM

Advantages

• Free to use.
• Good Ted-Ed support.

Disadvantages

• Non-video lesson content varies.

Manual? Please follow this link.