Turn your PowerPoint into an interactive online presentation
Office Mix is a PowerPoint add-in to Office 2013. Office Mix act a little as a screencast tool. You will transform your existing PowerPoint presentation into an interactive online lesson; Microsoft calls it a “Mix”.
- You will record audio and/or video of yourself explaining your lesson
- You will write on your slides like on a white board
- You will add quizzes and exercises to your lesson
- You will add web pages to your PowerPoint presentation
Useful link:
MIX official website: https://mix.office.com
Some Examples : https://mix.office.com/Gallery
Community Radio 
It makes the presentation very interactive. Good Site.
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