In the Ray wenderlich website do not exist the site anymore where there is a list of all the **free** video of the Rwdevcon ** Inspirational Talk**. I know that before there was a site where all the free videos of Rwdevcon 2016 inspirational talk but now can not find it.
@kiri_23 Thanks very much for your question, and my apologies for the delayed response.
As a courtesy to all of our readers, whenever a new RWDevCon takes place, we make the materials from the previous years RWDevCon free to everyone. This means that all of the material from RWDevCon 2017 is now free, and can be found here. 
I hope this helps!
All the best!