StoryLine is a commercial activity authoring tool.
It functions very like PowerPoint in that you create slides with different questions or tasks to complete.
The advantage it has to many normal Moodle tools is that it looks way more professional, and can cope well with mobile devices.
I would have to say it is well worth looking into, I use it and find it to be about the best tool on the market purely thanks to its intuitive way of doing things, as apposed to Adobe Captivate which is a monster.