I found this interesting and free site www.peoplbrain.com that allow us to create and share tutos and guides for free .
The interest is that you have a free viewer that can be embedded in any product page or other prestashop page .
You can create your own operating manual , or how to advice or anything else based on photos , videos ( youtube ones ) . It is really easy to create espacially on Chrome and you can add up to 5 differen languages .
I use it to create operting manual for my products and share it in my prestashop sales site and share it on facebook .
If you want an example see this page ( on the bottom on the page ) of my website :
http://www.carcoon.fr/boutique/1-veloce-taille-1-433-x-230cm.html
Anyone else know this web site or use it ?