Microsoft Office Mix allows for an easy way to make online lessons and presentations. It is a free PowerPoint 2013 / 365 add-in which can help turn your presentations into interactive online lessons.

Mix provides tools to record you giving your presentation, for instance. You can write on slides as though they were a whiteboard, record audio and video, take screenshots or record what's happening on your desktop. It's all available from the new Mix tab on the PowerPoint ribbon. You can also include custom quizzes, polls, videos and other apps, direct from the Office Apps store. Once you've finished simply click the Upload button and it'll be hosted for free at the Mix site.