This is one of my personal favorites :
Discover new ways to elevate your game with the updated DGCourseReview app!
It's entirely free and enhanced with features shaped by user feedback to ensure your best experience on the course. (App Store or Google Play)
...the perfection...
I've been on this guy's youtube channel for a couple of days. He's got the best quality disc golf videos I've seen on youtube.
http://www.youtube.com/user/lcgm8