This is the official Windows Phone App for Devoxx Conferences. It is compatible to Windows Phone 8.1 and Windows 10 Mobile.
Since it took so long to release Windows 10 Mobile, I decided to go from WP 8.1 but there will be a UWP Version of this App in the near future.
Just get the code, open it in Visual Studio 2015 (Community Edtion is enough) and start coding.